React Compiler — React Technical Interview Questions & Answers

React Compiler

React Compiler

  • The React Compiler (React Forget) auto-memoizes safe parts of your components so you write fewer useMemo/useCallback. It is not an excuse for impure render (new Date() as id, mutating props). You still write correct effect deps. Say: helper, not magic.
  • React Compiler — output: helper, not magic. Don’t ship impure render and hope the compiler saves you.

Technical Interview Tip: Auto-memo + purity still required.

Code Examples for React Compiler

Example

// React Compiler
console.log("compiler: skip extra re-renders when safe");
console.log("you still: pure render, correct effect deps");

React Compiler — output: helper, not magic. Don’t ship impure render and hope the compiler saves you.

How to Explain React Compiler to an Interviewer

Explain React Compiler as if you are teaching a junior — definition, then one tiny UI.

Does : auto-memo where safe. You : keep render pure.

What does the example show on screen (or print), and what does that prove?

React Compiler — output: helper, not magic

What mistake do freshers make with React Compiler?

hoping it fixes bad effects.