Episode 2 — React Frontend Architecture NextJS / 2.9 — Custom Hooks and Reusable Logic

2.9 — Interview Questions: Custom Hooks & Reusable Logic

Maps to 2.9.a–2.9.d

Beginner — Q1

What is a custom hook?

Model answer: A function named useX that calls other hooks, letting you reuse stateful logic across components while following the Rules of Hooks.

Beginner — Q2

Why extract logic into a hook instead of copying useEffect?

Model answer: DRY for stateful behavior, consistent cleanup, easier testing, and clearer component files focused on UI.

Intermediate — Q3

What belongs in useFetch vs TanStack Query?

Model answer: useFetch teaches effects + cancellation; TanStack Query adds cache, dedupe, retries—use a data library when those become requirements.

Intermediate — Q4

How do you separate business logic from UI?

Model answer: Keep rules in pure modules; hooks orchestrate React concerns; components render based on returned state and actions.

Advanced — Q5

Why avoid returning JSX from reusable hooks?

Model answer: It couples presentation to logic, hurts composition, complicates testing, and encourages hidden UI dependencies.

Advanced — Q6

How do you keep hook APIs maintainable?

Model answer: Stable object returns, documented fields, feature-grouped files, tests for state transitions, delete dead hooks in the same PR.

Quick-fire

#	Topic	One-line
1	Custom hook	use-prefix + calls hooks
2	Pure logic	non-hook TS module
3	useFetch	effect + abort + status union
4	Maintainability	name + return shape + tests
5	UI separation	no JSX from domain hooks
6	Rules	top-level hook calls

Rapid cards

RC001

Prompt: Choose hook vs pure fn vs data lib for scenario 1.
Skeleton: state? effects? sharing? cache needs?

RC002

Prompt: Choose hook vs pure fn vs data lib for scenario 2.
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RC003

Prompt: Choose hook vs pure fn vs data lib for scenario 3.
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RC004

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RC005

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RC006

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RC007

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RC008

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RC009

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RC010

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RC011

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RC012

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RC013

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RC014

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RC015

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RC016

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RC017

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RC018

Prompt: Choose hook vs pure fn vs data lib for scenario 18.
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RC019

Prompt: Choose hook vs pure fn vs data lib for scenario 19.
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RC020

Prompt: Choose hook vs pure fn vs data lib for scenario 20.
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RC021

Prompt: Choose hook vs pure fn vs data lib for scenario 21.
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RC022

Prompt: Choose hook vs pure fn vs data lib for scenario 22.
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RC023

Prompt: Choose hook vs pure fn vs data lib for scenario 23.
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RC024

Prompt: Choose hook vs pure fn vs data lib for scenario 24.
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RC025

Prompt: Choose hook vs pure fn vs data lib for scenario 25.
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RC026

Prompt: Choose hook vs pure fn vs data lib for scenario 26.
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RC027

Prompt: Choose hook vs pure fn vs data lib for scenario 27.
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RC028

Prompt: Choose hook vs pure fn vs data lib for scenario 28.
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RC029

Prompt: Choose hook vs pure fn vs data lib for scenario 29.
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RC030

Prompt: Choose hook vs pure fn vs data lib for scenario 30.
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RC031

Prompt: Choose hook vs pure fn vs data lib for scenario 31.
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RC032

Prompt: Choose hook vs pure fn vs data lib for scenario 32.
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RC033

Prompt: Choose hook vs pure fn vs data lib for scenario 33.
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RC034

Prompt: Choose hook vs pure fn vs data lib for scenario 34.
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RC035

Prompt: Choose hook vs pure fn vs data lib for scenario 35.
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RC036

Prompt: Choose hook vs pure fn vs data lib for scenario 36.
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RC037

Prompt: Choose hook vs pure fn vs data lib for scenario 37.
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RC038

Prompt: Choose hook vs pure fn vs data lib for scenario 38.
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RC039

Prompt: Choose hook vs pure fn vs data lib for scenario 39.
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RC040

Prompt: Choose hook vs pure fn vs data lib for scenario 40.
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RC041

Prompt: Choose hook vs pure fn vs data lib for scenario 41.
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RC042

Prompt: Choose hook vs pure fn vs data lib for scenario 42.
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RC043

Prompt: Choose hook vs pure fn vs data lib for scenario 43.
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RC044

Prompt: Choose hook vs pure fn vs data lib for scenario 44.
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RC045

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RC046

Prompt: Choose hook vs pure fn vs data lib for scenario 46.
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RC047

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RC048

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RC049

Prompt: Choose hook vs pure fn vs data lib for scenario 49.
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RC050

Prompt: Choose hook vs pure fn vs data lib for scenario 50.
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RC051

Prompt: Choose hook vs pure fn vs data lib for scenario 51.
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RC052

Prompt: Choose hook vs pure fn vs data lib for scenario 52.
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RC053

Prompt: Choose hook vs pure fn vs data lib for scenario 53.
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RC054

Prompt: Choose hook vs pure fn vs data lib for scenario 54.
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RC055

Prompt: Choose hook vs pure fn vs data lib for scenario 55.
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RC056

Prompt: Choose hook vs pure fn vs data lib for scenario 56.
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RC057

Prompt: Choose hook vs pure fn vs data lib for scenario 57.
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RC058

Prompt: Choose hook vs pure fn vs data lib for scenario 58.
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RC059

Prompt: Choose hook vs pure fn vs data lib for scenario 59.
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RC060

Prompt: Choose hook vs pure fn vs data lib for scenario 60.
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RC061

Prompt: Choose hook vs pure fn vs data lib for scenario 61.
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RC062

Prompt: Choose hook vs pure fn vs data lib for scenario 62.
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RC063

Prompt: Choose hook vs pure fn vs data lib for scenario 63.
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RC064

Prompt: Choose hook vs pure fn vs data lib for scenario 64.
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RC065

Prompt: Choose hook vs pure fn vs data lib for scenario 65.
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RC066

Prompt: Choose hook vs pure fn vs data lib for scenario 66.
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RC067

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RC068

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RC069

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RC070

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RC071

Prompt: Choose hook vs pure fn vs data lib for scenario 71.
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RC072

Prompt: Choose hook vs pure fn vs data lib for scenario 72.
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RC073

Prompt: Choose hook vs pure fn vs data lib for scenario 73.
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RC074

Prompt: Choose hook vs pure fn vs data lib for scenario 74.
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RC075

Prompt: Choose hook vs pure fn vs data lib for scenario 75.
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RC076

Prompt: Choose hook vs pure fn vs data lib for scenario 76.
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RC077

Prompt: Choose hook vs pure fn vs data lib for scenario 77.
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RC078

Prompt: Choose hook vs pure fn vs data lib for scenario 78.
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RC079

Prompt: Choose hook vs pure fn vs data lib for scenario 79.
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RC080

Prompt: Choose hook vs pure fn vs data lib for scenario 80.
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RC081

Prompt: Choose hook vs pure fn vs data lib for scenario 81.
Skeleton: state? effects? sharing? cache needs?

RC082

Prompt: Choose hook vs pure fn vs data lib for scenario 82.
Skeleton: state? effects? sharing? cache needs?

RC083

Prompt: Choose hook vs pure fn vs data lib for scenario 83.
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RC084

Prompt: Choose hook vs pure fn vs data lib for scenario 84.
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RC085

Prompt: Choose hook vs pure fn vs data lib for scenario 85.
Skeleton: state? effects? sharing? cache needs?

RC086

Prompt: Choose hook vs pure fn vs data lib for scenario 86.
Skeleton: state? effects? sharing? cache needs?

RC087

Prompt: Choose hook vs pure fn vs data lib for scenario 87.
Skeleton: state? effects? sharing? cache needs?

RC088

Prompt: Choose hook vs pure fn vs data lib for scenario 88.
Skeleton: state? effects? sharing? cache needs?

RC089

Prompt: Choose hook vs pure fn vs data lib for scenario 89.
Skeleton: state? effects? sharing? cache needs?

RC090

Prompt: Choose hook vs pure fn vs data lib for scenario 90.
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RC091

Prompt: Choose hook vs pure fn vs data lib for scenario 91.
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RC092

Prompt: Choose hook vs pure fn vs data lib for scenario 92.
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RC093

Prompt: Choose hook vs pure fn vs data lib for scenario 93.
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RC094

Prompt: Choose hook vs pure fn vs data lib for scenario 94.
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RC095

Prompt: Choose hook vs pure fn vs data lib for scenario 95.
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RC096

Prompt: Choose hook vs pure fn vs data lib for scenario 96.
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RC097

Prompt: Choose hook vs pure fn vs data lib for scenario 97.
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RC098

Prompt: Choose hook vs pure fn vs data lib for scenario 98.
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RC099

Prompt: Choose hook vs pure fn vs data lib for scenario 99.
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RC100

Prompt: Choose hook vs pure fn vs data lib for scenario 100.
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RC101

Prompt: Choose hook vs pure fn vs data lib for scenario 101.
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RC102

Prompt: Choose hook vs pure fn vs data lib for scenario 102.
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RC103

Prompt: Choose hook vs pure fn vs data lib for scenario 103.
Skeleton: state? effects? sharing? cache needs?

RC104

Prompt: Choose hook vs pure fn vs data lib for scenario 104.
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RC105

Prompt: Choose hook vs pure fn vs data lib for scenario 105.
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RC106

Prompt: Choose hook vs pure fn vs data lib for scenario 106.
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RC107

Prompt: Choose hook vs pure fn vs data lib for scenario 107.
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RC108

Prompt: Choose hook vs pure fn vs data lib for scenario 108.
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RC109

Prompt: Choose hook vs pure fn vs data lib for scenario 109.
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RC110

Prompt: Choose hook vs pure fn vs data lib for scenario 110.
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RC111

Prompt: Choose hook vs pure fn vs data lib for scenario 111.
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RC112

Prompt: Choose hook vs pure fn vs data lib for scenario 112.
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RC113

Prompt: Choose hook vs pure fn vs data lib for scenario 113.
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RC114

Prompt: Choose hook vs pure fn vs data lib for scenario 114.
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RC115

Prompt: Choose hook vs pure fn vs data lib for scenario 115.
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RC116

Prompt: Choose hook vs pure fn vs data lib for scenario 116.
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RC117

Prompt: Choose hook vs pure fn vs data lib for scenario 117.
Skeleton: state? effects? sharing? cache needs?

RC118

Prompt: Choose hook vs pure fn vs data lib for scenario 118.
Skeleton: state? effects? sharing? cache needs?

RC119

Prompt: Choose hook vs pure fn vs data lib for scenario 119.
Skeleton: state? effects? sharing? cache needs?

RC120

Prompt: Choose hook vs pure fn vs data lib for scenario 120.
Skeleton: state? effects? sharing? cache needs?

RC121

Prompt: Choose hook vs pure fn vs data lib for scenario 121.
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RC122

Prompt: Choose hook vs pure fn vs data lib for scenario 122.
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RC123

Prompt: Choose hook vs pure fn vs data lib for scenario 123.
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RC124

Prompt: Choose hook vs pure fn vs data lib for scenario 124.
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RC125

Prompt: Choose hook vs pure fn vs data lib for scenario 125.
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RC126

Prompt: Choose hook vs pure fn vs data lib for scenario 126.
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RC127

Prompt: Choose hook vs pure fn vs data lib for scenario 127.
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RC128

Prompt: Choose hook vs pure fn vs data lib for scenario 128.
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RC129

Prompt: Choose hook vs pure fn vs data lib for scenario 129.
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RC130

Prompt: Choose hook vs pure fn vs data lib for scenario 130.
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RC131

Prompt: Choose hook vs pure fn vs data lib for scenario 131.
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RC132

Prompt: Choose hook vs pure fn vs data lib for scenario 132.
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RC133

Prompt: Choose hook vs pure fn vs data lib for scenario 133.
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RC134

Prompt: Choose hook vs pure fn vs data lib for scenario 134.
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RC135

Prompt: Choose hook vs pure fn vs data lib for scenario 135.
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RC136

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RC137

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RC138

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RC139

Prompt: Choose hook vs pure fn vs data lib for scenario 139.
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RC140

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RC141

Prompt: Choose hook vs pure fn vs data lib for scenario 141.
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RC142

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RC143

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RC144

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RC145

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RC146

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RC147

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RC148

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RC149

Prompt: Choose hook vs pure fn vs data lib for scenario 149.
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RC150

Prompt: Choose hook vs pure fn vs data lib for scenario 150.
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RC151

Prompt: Choose hook vs pure fn vs data lib for scenario 151.
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RC152

Prompt: Choose hook vs pure fn vs data lib for scenario 152.
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RC153

Prompt: Choose hook vs pure fn vs data lib for scenario 153.
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RC154

Prompt: Choose hook vs pure fn vs data lib for scenario 154.
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RC155

Prompt: Choose hook vs pure fn vs data lib for scenario 155.
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RC156

Prompt: Choose hook vs pure fn vs data lib for scenario 156.
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RC157

Prompt: Choose hook vs pure fn vs data lib for scenario 157.
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RC158

Prompt: Choose hook vs pure fn vs data lib for scenario 158.
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RC159

Prompt: Choose hook vs pure fn vs data lib for scenario 159.
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RC160

Prompt: Choose hook vs pure fn vs data lib for scenario 160.
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RC161

Prompt: Choose hook vs pure fn vs data lib for scenario 161.
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RC162

Prompt: Choose hook vs pure fn vs data lib for scenario 162.
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RC163

Prompt: Choose hook vs pure fn vs data lib for scenario 163.
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RC164

Prompt: Choose hook vs pure fn vs data lib for scenario 164.
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RC165

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RC166

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RC167

Prompt: Choose hook vs pure fn vs data lib for scenario 167.
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RC168

Prompt: Choose hook vs pure fn vs data lib for scenario 168.
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RC169

Prompt: Choose hook vs pure fn vs data lib for scenario 169.
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RC170

Prompt: Choose hook vs pure fn vs data lib for scenario 170.
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RC171

Prompt: Choose hook vs pure fn vs data lib for scenario 171.
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RC172

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RC173

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RC174

Prompt: Choose hook vs pure fn vs data lib for scenario 174.
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RC175

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RC176

Prompt: Choose hook vs pure fn vs data lib for scenario 176.
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RC177

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RC178

Prompt: Choose hook vs pure fn vs data lib for scenario 178.
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RC179

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RC180

Prompt: Choose hook vs pure fn vs data lib for scenario 180.
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RC181

Prompt: Choose hook vs pure fn vs data lib for scenario 181.
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RC182

Prompt: Choose hook vs pure fn vs data lib for scenario 182.
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RC183

Prompt: Choose hook vs pure fn vs data lib for scenario 183.
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RC184

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RC185

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RC186

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RC187

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RC188

Prompt: Choose hook vs pure fn vs data lib for scenario 188.
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RC189

Prompt: Choose hook vs pure fn vs data lib for scenario 189.
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RC190

Prompt: Choose hook vs pure fn vs data lib for scenario 190.
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RC191

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RC192

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RC193

Prompt: Choose hook vs pure fn vs data lib for scenario 193.
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RC194

Prompt: Choose hook vs pure fn vs data lib for scenario 194.
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RC195

Prompt: Choose hook vs pure fn vs data lib for scenario 195.
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RC196

Prompt: Choose hook vs pure fn vs data lib for scenario 196.
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RC197

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RC198

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RC199

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RC200

Prompt: Choose hook vs pure fn vs data lib for scenario 200.
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