Episode 2 — React Frontend Architecture NextJS / 2.14 — State Management Using Redux

2.14.d — `react-redux`: connecting Redux to React components

Learning outcomes

Use Provider to inject the store.
Subscribe components with useSelector / useDispatch (modern) and understand connect (legacy).
Apply selector discipline to avoid unnecessary renders.

Provider

import { Provider } from "react-redux";
import { store } from "./store";

export function App() {
  return (
    <Provider store={store}>
      <RootRouter />
    </Provider>
  );
}

Hooks API

import { useDispatch, useSelector } from "react-redux";

export function Todos() {
  const todos = useSelector((s) => s.todos);
  const dispatch = useDispatch();

  return (
    <ul>
      {todos.map((t) => (
        <li key={t.id}>{t.title}</li>
      ))}
      <button onClick={() => dispatch({ type: "todos/add", payload: { id: crypto.randomUUID(), title: "New" } })}>
        Add
      </button>
    </ul>
  );
}

Selectors and memoization

If useSelector returns a new object/array each call, React-Redux assumes state changed → rerender.

Prefer:

selecting primitives
memoized selectors (e.g., createSelector from Reselect)

`connect` (legacy, but still real)

Many codebases still use connect. Know how it maps state and dispatch to props, and why hooks are preferred for new code.

Appendix — Scenario bank (basic → advanced)

Use these as design-review flashcards: what breaks, why Redux helps or hurts, what you change, what you say in an interview.

RX3-001 — react-redux scenario #1

Level: Beginner
Symptom: inconsistent UI state across routes after 13 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-002 — react-redux scenario #2

Level: Beginner+
Symptom: inconsistent UI state across routes after 26 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-003 — react-redux scenario #3

Level: Intermediate
Symptom: inconsistent UI state across routes after 39 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-004 — react-redux scenario #4

Level: Intermediate+
Symptom: inconsistent UI state across routes after 52 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-005 — react-redux scenario #5

Level: Advanced
Symptom: inconsistent UI state across routes after 65 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-006 — react-redux scenario #6

Level: Advanced+
Symptom: inconsistent UI state across routes after 78 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-007 — react-redux scenario #7

Level: Beginner
Symptom: inconsistent UI state across routes after 91 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-008 — react-redux scenario #8

Level: Beginner+
Symptom: inconsistent UI state across routes after 104 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-009 — react-redux scenario #9

Level: Intermediate
Symptom: inconsistent UI state across routes after 117 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-010 — react-redux scenario #10

Level: Intermediate+
Symptom: inconsistent UI state across routes after 130 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-011 — react-redux scenario #11

Level: Advanced
Symptom: inconsistent UI state across routes after 143 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-012 — react-redux scenario #12

Level: Advanced+
Symptom: inconsistent UI state across routes after 156 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-013 — react-redux scenario #13

Level: Beginner
Symptom: inconsistent UI state across routes after 169 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-014 — react-redux scenario #14

Level: Beginner+
Symptom: inconsistent UI state across routes after 182 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-015 — react-redux scenario #15

Level: Intermediate
Symptom: inconsistent UI state across routes after 195 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-016 — react-redux scenario #16

Level: Intermediate+
Symptom: inconsistent UI state across routes after 8 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-017 — react-redux scenario #17

Level: Advanced
Symptom: inconsistent UI state across routes after 21 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-018 — react-redux scenario #18

Level: Advanced+
Symptom: inconsistent UI state across routes after 34 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-019 — react-redux scenario #19

Level: Beginner
Symptom: inconsistent UI state across routes after 47 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-020 — react-redux scenario #20

Level: Beginner+
Symptom: inconsistent UI state across routes after 60 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-021 — react-redux scenario #21

Level: Intermediate
Symptom: inconsistent UI state across routes after 73 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-022 — react-redux scenario #22

Level: Intermediate+
Symptom: inconsistent UI state across routes after 86 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-023 — react-redux scenario #23

Level: Advanced
Symptom: inconsistent UI state across routes after 99 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-024 — react-redux scenario #24

Level: Advanced+
Symptom: inconsistent UI state across routes after 112 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-025 — react-redux scenario #25

Level: Beginner
Symptom: inconsistent UI state across routes after 125 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-026 — react-redux scenario #26

Level: Beginner+
Symptom: inconsistent UI state across routes after 138 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-027 — react-redux scenario #27

Level: Intermediate
Symptom: inconsistent UI state across routes after 151 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-028 — react-redux scenario #28

Level: Intermediate+
Symptom: inconsistent UI state across routes after 164 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-029 — react-redux scenario #29

Level: Advanced
Symptom: inconsistent UI state across routes after 177 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-030 — react-redux scenario #30

Level: Advanced+
Symptom: inconsistent UI state across routes after 190 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-031 — react-redux scenario #31

Level: Beginner
Symptom: inconsistent UI state across routes after 3 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-032 — react-redux scenario #32

Level: Beginner+
Symptom: inconsistent UI state across routes after 16 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-033 — react-redux scenario #33

Level: Intermediate
Symptom: inconsistent UI state across routes after 29 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-034 — react-redux scenario #34

Level: Intermediate+
Symptom: inconsistent UI state across routes after 42 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-035 — react-redux scenario #35

Level: Advanced
Symptom: inconsistent UI state across routes after 55 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-036 — react-redux scenario #36

Level: Advanced+
Symptom: inconsistent UI state across routes after 68 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-037 — react-redux scenario #37

Level: Beginner
Symptom: inconsistent UI state across routes after 81 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-038 — react-redux scenario #38

Level: Beginner+
Symptom: inconsistent UI state across routes after 94 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-039 — react-redux scenario #39

Level: Intermediate
Symptom: inconsistent UI state across routes after 107 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-040 — react-redux scenario #40

Level: Intermediate+
Symptom: inconsistent UI state across routes after 120 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-041 — react-redux scenario #41

Level: Advanced
Symptom: inconsistent UI state across routes after 133 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-042 — react-redux scenario #42

Level: Advanced+
Symptom: inconsistent UI state across routes after 146 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-043 — react-redux scenario #43

Level: Beginner
Symptom: inconsistent UI state across routes after 159 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-044 — react-redux scenario #44

Level: Beginner+
Symptom: inconsistent UI state across routes after 172 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-045 — react-redux scenario #45

Level: Intermediate
Symptom: inconsistent UI state across routes after 185 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-046 — react-redux scenario #46

Level: Intermediate+
Symptom: inconsistent UI state across routes after 198 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-047 — react-redux scenario #47

Level: Advanced
Symptom: inconsistent UI state across routes after 11 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-048 — react-redux scenario #48

Level: Advanced+
Symptom: inconsistent UI state across routes after 24 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-049 — react-redux scenario #49

Level: Beginner
Symptom: inconsistent UI state across routes after 37 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-050 — react-redux scenario #50

Level: Beginner+
Symptom: inconsistent UI state across routes after 50 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-051 — react-redux scenario #51

Level: Intermediate
Symptom: inconsistent UI state across routes after 63 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-052 — react-redux scenario #52

Level: Intermediate+
Symptom: inconsistent UI state across routes after 76 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-053 — react-redux scenario #53

Level: Advanced
Symptom: inconsistent UI state across routes after 89 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-054 — react-redux scenario #54

Level: Advanced+
Symptom: inconsistent UI state across routes after 102 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-055 — react-redux scenario #55

Level: Beginner
Symptom: inconsistent UI state across routes after 115 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-056 — react-redux scenario #56

Level: Beginner+
Symptom: inconsistent UI state across routes after 128 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-057 — react-redux scenario #57

Level: Intermediate
Symptom: inconsistent UI state across routes after 141 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-058 — react-redux scenario #58

Level: Intermediate+
Symptom: inconsistent UI state across routes after 154 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-059 — react-redux scenario #59

Level: Advanced
Symptom: inconsistent UI state across routes after 167 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-060 — react-redux scenario #60

Level: Advanced+
Symptom: inconsistent UI state across routes after 180 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-061 — react-redux scenario #61

Level: Beginner
Symptom: inconsistent UI state across routes after 193 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-062 — react-redux scenario #62

Level: Beginner+
Symptom: inconsistent UI state across routes after 6 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-063 — react-redux scenario #63

Level: Intermediate
Symptom: inconsistent UI state across routes after 19 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-064 — react-redux scenario #64

Level: Intermediate+
Symptom: inconsistent UI state across routes after 32 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-065 — react-redux scenario #65

Level: Advanced
Symptom: inconsistent UI state across routes after 45 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-066 — react-redux scenario #66

Level: Advanced+
Symptom: inconsistent UI state across routes after 58 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-067 — react-redux scenario #67

Level: Beginner
Symptom: inconsistent UI state across routes after 71 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-068 — react-redux scenario #68

Level: Beginner+
Symptom: inconsistent UI state across routes after 84 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-069 — react-redux scenario #69

Level: Intermediate
Symptom: inconsistent UI state across routes after 97 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-070 — react-redux scenario #70

Level: Intermediate+
Symptom: inconsistent UI state across routes after 110 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-071 — react-redux scenario #71

Level: Advanced
Symptom: inconsistent UI state across routes after 123 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-072 — react-redux scenario #72

Level: Advanced+
Symptom: inconsistent UI state across routes after 136 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-073 — react-redux scenario #73

Level: Beginner
Symptom: inconsistent UI state across routes after 149 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-074 — react-redux scenario #74

Level: Beginner+
Symptom: inconsistent UI state across routes after 162 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-075 — react-redux scenario #75

Level: Intermediate
Symptom: inconsistent UI state across routes after 175 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-076 — react-redux scenario #76

Level: Intermediate+
Symptom: inconsistent UI state across routes after 188 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-077 — react-redux scenario #77

Level: Advanced
Symptom: inconsistent UI state across routes after 1 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-078 — react-redux scenario #78

Level: Advanced+
Symptom: inconsistent UI state across routes after 14 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-079 — react-redux scenario #79

Level: Beginner
Symptom: inconsistent UI state across routes after 27 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-080 — react-redux scenario #80

Level: Beginner+
Symptom: inconsistent UI state across routes after 40 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-081 — react-redux scenario #81

Level: Intermediate
Symptom: inconsistent UI state across routes after 53 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-082 — react-redux scenario #82

Level: Intermediate+
Symptom: inconsistent UI state across routes after 66 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-083 — react-redux scenario #83

Level: Advanced
Symptom: inconsistent UI state across routes after 79 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-084 — react-redux scenario #84

Level: Advanced+
Symptom: inconsistent UI state across routes after 92 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-085 — react-redux scenario #85

Level: Beginner
Symptom: inconsistent UI state across routes after 105 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-086 — react-redux scenario #86

Level: Beginner+
Symptom: inconsistent UI state across routes after 118 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-087 — react-redux scenario #87

Level: Intermediate
Symptom: inconsistent UI state across routes after 131 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-088 — react-redux scenario #88

Level: Intermediate+
Symptom: inconsistent UI state across routes after 144 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-089 — react-redux scenario #89

Level: Advanced
Symptom: inconsistent UI state across routes after 157 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-090 — react-redux scenario #90

Level: Advanced+
Symptom: inconsistent UI state across routes after 170 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-091 — react-redux scenario #91

Level: Beginner
Symptom: inconsistent UI state across routes after 183 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-092 — react-redux scenario #92

Level: Beginner+
Symptom: inconsistent UI state across routes after 196 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-093 — react-redux scenario #93

Level: Intermediate
Symptom: inconsistent UI state across routes after 9 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-094 — react-redux scenario #94

Level: Intermediate+
Symptom: inconsistent UI state across routes after 22 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-095 — react-redux scenario #95

Level: Advanced
Symptom: inconsistent UI state across routes after 35 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-096 — react-redux scenario #96

Level: Advanced+
Symptom: inconsistent UI state across routes after 48 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-097 — react-redux scenario #97

Level: Beginner
Symptom: inconsistent UI state across routes after 61 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-098 — react-redux scenario #98

Level: Beginner+
Symptom: inconsistent UI state across routes after 74 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-099 — react-redux scenario #99

Level: Intermediate
Symptom: inconsistent UI state across routes after 87 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-100 — react-redux scenario #100

Level: Intermediate+
Symptom: inconsistent UI state across routes after 100 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-101 — react-redux scenario #101

Level: Advanced
Symptom: inconsistent UI state across routes after 113 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-102 — react-redux scenario #102

Level: Advanced+
Symptom: inconsistent UI state across routes after 126 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-103 — react-redux scenario #103

Level: Beginner
Symptom: inconsistent UI state across routes after 139 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-104 — react-redux scenario #104

Level: Beginner+
Symptom: inconsistent UI state across routes after 152 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-105 — react-redux scenario #105

Level: Intermediate
Symptom: inconsistent UI state across routes after 165 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-106 — react-redux scenario #106

Level: Intermediate+
Symptom: inconsistent UI state across routes after 178 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-107 — react-redux scenario #107

Level: Advanced
Symptom: inconsistent UI state across routes after 191 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-108 — react-redux scenario #108

Level: Advanced+
Symptom: inconsistent UI state across routes after 4 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-109 — react-redux scenario #109

Level: Beginner
Symptom: inconsistent UI state across routes after 17 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-110 — react-redux scenario #110

Level: Beginner+
Symptom: inconsistent UI state across routes after 30 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-111 — react-redux scenario #111

Level: Intermediate
Symptom: inconsistent UI state across routes after 43 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-112 — react-redux scenario #112

Level: Intermediate+
Symptom: inconsistent UI state across routes after 56 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-113 — react-redux scenario #113

Level: Advanced
Symptom: inconsistent UI state across routes after 69 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-114 — react-redux scenario #114

Level: Advanced+
Symptom: inconsistent UI state across routes after 82 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-115 — react-redux scenario #115

Level: Beginner
Symptom: inconsistent UI state across routes after 95 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-116 — react-redux scenario #116

Level: Beginner+
Symptom: inconsistent UI state across routes after 108 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-117 — react-redux scenario #117

Level: Intermediate
Symptom: inconsistent UI state across routes after 121 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-118 — react-redux scenario #118

Level: Intermediate+
Symptom: inconsistent UI state across routes after 134 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-119 — react-redux scenario #119

Level: Advanced
Symptom: inconsistent UI state across routes after 147 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-120 — react-redux scenario #120

Level: Advanced+
Symptom: inconsistent UI state across routes after 160 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-121 — react-redux scenario #121

Level: Beginner
Symptom: inconsistent UI state across routes after 173 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-122 — react-redux scenario #122

Level: Beginner+
Symptom: inconsistent UI state across routes after 186 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-123 — react-redux scenario #123

Level: Intermediate
Symptom: inconsistent UI state across routes after 199 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-124 — react-redux scenario #124

Level: Intermediate+
Symptom: inconsistent UI state across routes after 12 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-125 — react-redux scenario #125

Level: Advanced
Symptom: inconsistent UI state across routes after 25 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-126 — react-redux scenario #126

Level: Advanced+
Symptom: inconsistent UI state across routes after 38 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-127 — react-redux scenario #127

Level: Beginner
Symptom: inconsistent UI state across routes after 51 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-128 — react-redux scenario #128

Level: Beginner+
Symptom: inconsistent UI state across routes after 64 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-129 — react-redux scenario #129

Level: Intermediate
Symptom: inconsistent UI state across routes after 77 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-130 — react-redux scenario #130

Level: Intermediate+
Symptom: inconsistent UI state across routes after 90 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-131 — react-redux scenario #131

Level: Advanced
Symptom: inconsistent UI state across routes after 103 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-132 — react-redux scenario #132

Level: Advanced+
Symptom: inconsistent UI state across routes after 116 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-133 — react-redux scenario #133

Level: Beginner
Symptom: inconsistent UI state across routes after 129 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-134 — react-redux scenario #134

Level: Beginner+
Symptom: inconsistent UI state across routes after 142 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-135 — react-redux scenario #135

Level: Intermediate
Symptom: inconsistent UI state across routes after 155 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-136 — react-redux scenario #136

Level: Intermediate+
Symptom: inconsistent UI state across routes after 168 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-137 — react-redux scenario #137

Level: Advanced
Symptom: inconsistent UI state across routes after 181 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-138 — react-redux scenario #138

Level: Advanced+
Symptom: inconsistent UI state across routes after 194 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-139 — react-redux scenario #139

Level: Beginner
Symptom: inconsistent UI state across routes after 7 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-140 — react-redux scenario #140

Level: Beginner+
Symptom: inconsistent UI state across routes after 20 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-141 — react-redux scenario #141

Level: Intermediate
Symptom: inconsistent UI state across routes after 33 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-142 — react-redux scenario #142

Level: Intermediate+
Symptom: inconsistent UI state across routes after 46 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-143 — react-redux scenario #143

Level: Advanced
Symptom: inconsistent UI state across routes after 59 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-144 — react-redux scenario #144

Level: Advanced+
Symptom: inconsistent UI state across routes after 72 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-145 — react-redux scenario #145

Level: Beginner
Symptom: inconsistent UI state across routes after 85 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-146 — react-redux scenario #146

Level: Beginner+
Symptom: inconsistent UI state across routes after 98 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-147 — react-redux scenario #147

Level: Intermediate
Symptom: inconsistent UI state across routes after 111 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-148 — react-redux scenario #148

Level: Intermediate+
Symptom: inconsistent UI state across routes after 124 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-149 — react-redux scenario #149

Level: Advanced
Symptom: inconsistent UI state across routes after 137 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-150 — react-redux scenario #150

Level: Advanced+
Symptom: inconsistent UI state across routes after 150 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-151 — react-redux scenario #151

Level: Beginner
Symptom: inconsistent UI state across routes after 163 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-152 — react-redux scenario #152

Level: Beginner+
Symptom: inconsistent UI state across routes after 176 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-153 — react-redux scenario #153

Level: Intermediate
Symptom: inconsistent UI state across routes after 189 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Provider placed too low so only subtree can access store accidentally.
Primary remediation: Place Provider at app root; document exceptions (micro-frontends).
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-154 — react-redux scenario #154

Level: Intermediate+
Symptom: inconsistent UI state across routes after 2 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Using useSelector with unstable object literals as return values.
Primary remediation: Avoid multiple stores unless architectural isolation is explicit.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-155 — react-redux scenario #155

Level: Advanced
Symptom: inconsistent UI state across routes after 15 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Missing shallowEqual for object selections from state.
Primary remediation: Dispatch from effects/handlers only; never during render.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-156 — react-redux scenario #156

Level: Advanced+
Symptom: inconsistent UI state across routes after 28 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: connect mapStateToProps recreated each render causing unnecessary re-renders.
Primary remediation: Memoize selectors with reselect; return primitives when possible.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

RX3-157 — react-redux scenario #157

Level: Beginner
Symptom: inconsistent UI state across routes after 41 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Dispatching inside render causing infinite loops.
Primary remediation: Use shallowEqual or split selectors.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Hooks API is modern default; connect still appears in legacy codebases.

RX3-158 — react-redux scenario #158

Level: Beginner+
Symptom: inconsistent UI state across routes after 54 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Multiple stores in one app without strict isolation boundaries.
Primary remediation: Return stable references from selectors; memoize derived objects.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: react-redux bridges store subscription to React reconciliation efficiently when selectors are disciplined.

<< 2.14 Overview

2.14.d — react-redux: connecting Redux to React components