Question 1

How do you pass data between components in React?

Accepted Answer

**Target Audience:** Engineers preparing for React interviews — assumes props and state basics. **Difficulty:** Easy to Medium > **How to read this doc:** Concepts are explained in plain language first, then tagged with 📌 Interview term:. The composition measurement referenced in section 6 was produced by counting real renders on React 19.2.8; see composition for the full figures. ## 1. Why This Ev

Question 2

What is the Context API in React and when would you use it?

Accepted Answer

**Target Audience:** Engineers preparing for React interviews — assumes props and state. **Difficulty:** Medium > **How to read this doc:** Concepts are explained in plain language first, then tagged with 📌 Interview term:. The default-value and re-render behaviour below were measured on React 19.2.8. This doc covers *what Context is and when to use it*; why it re-renders every consumer covers

Question 3

What is 'prop drilling' and how can it be avoided?

Accepted Answer

**Target Audience:** Engineers preparing for React interviews — assumes props and components. **Difficulty:** Medium > **How to read this doc:** Concepts are explained in plain language first, then tagged with 📌 Interview term:. The re-render figures quoted in section 4 were measured on React 19.2.8; see avoiding re-renders with composition for the full run. ## 1. Why This Even Matters — A

Question 4

How do you manage global state in a large React application?

Accepted Answer

**Target Audience:** Engineers preparing for React interviews — assumes Context and hooks. **Difficulty:** Medium > **How to read this doc:** Concepts are explained in plain language first, then tagged with 📌 Interview term:. This is a judgement question, so it leans on the measured Context behaviour from why Context re-renders every consumer rather than introducing new measurements. ## 1. Why

REACT.JSDECODED.

Easy

How do you pass data between components in React?

Medium

What is the Context API in React and when would you use it?

What is 'prop drilling' and how can it be avoided?

How do you manage global state in a large React application?