Rendering & Performance interview questions

1. A.a higher-order component that skips re-rendering when a component's props are shallowly equal
2. B.a development tool that double-invokes certain functions to surface unsafe side effects
3. C.moving shared state to the closest common ancestor so sibling components stay in sync
4. D.React's diffing of the new and previous element trees to compute the minimal set of DOM updates

Answer + AI explanation with Pro

1. A.Reconciliation
2. B.Lifting state up
3. C.Lazy loading
4. D.Strict Mode

Answer + AI explanation with Pro

1. A.Reconciliation — an in-memory representation of the UI that React diffs against to batch real DOM changes
2. B.Reconciliation — a development tool that double-invokes certain functions to surface unsafe side effects
3. C.Reconciliation — moving shared state to the closest common ancestor so sibling components stay in sync
4. D.Reconciliation — React's diffing of the new and previous element trees to compute the minimal set of DOM updates

Answer + AI explanation with Pro

1. A.moving shared state to the closest common ancestor so sibling components stay in sync
2. B.a higher-order component that skips re-rendering when a component's props are shallowly equal
3. C.a development tool that double-invokes certain functions to surface unsafe side effects
4. D.an in-memory representation of the UI that React diffs against to batch real DOM changes

Answer + AI explanation with Pro

1. A.React.memo
2. B.Virtual DOM
3. C.Lifting state up
4. D.Reconciliation

Answer + AI explanation with Pro

1. A.Virtual DOM — React's diffing of the new and previous element trees to compute the minimal set of DOM updates
2. B.Virtual DOM — an in-memory representation of the UI that React diffs against to batch real DOM changes
3. C.Virtual DOM — a higher-order component that skips re-rendering when a component's props are shallowly equal
4. D.Virtual DOM — a development tool that double-invokes certain functions to surface unsafe side effects

Answer + AI explanation with Pro

1. A.React's diffing of the new and previous element trees to compute the minimal set of DOM updates
2. B.a higher-order component that skips re-rendering when a component's props are shallowly equal
3. C.an in-memory representation of the UI that React diffs against to batch real DOM changes
4. D.using React.lazy with Suspense to code-split and load a component only when it is rendered

Answer + AI explanation with Pro

1. A.Virtual DOM
2. B.Reconciliation
3. C.React.memo
4. D.Strict Mode

Answer + AI explanation with Pro

1. A.React.memo — a development tool that double-invokes certain functions to surface unsafe side effects
2. B.React.memo — using React.lazy with Suspense to code-split and load a component only when it is rendered
3. C.React.memo — a higher-order component that skips re-rendering when a component's props are shallowly equal
4. D.React.memo — an in-memory representation of the UI that React diffs against to batch real DOM changes

Answer + AI explanation with Pro

1. A.an in-memory representation of the UI that React diffs against to batch real DOM changes
2. B.a higher-order component that skips re-rendering when a component's props are shallowly equal
3. C.using React.lazy with Suspense to code-split and load a component only when it is rendered
4. D.moving shared state to the closest common ancestor so sibling components stay in sync

Answer + AI explanation with Pro

1. A.React.memo
2. B.Lifting state up
3. C.Virtual DOM
4. D.Lazy loading

Answer + AI explanation with Pro

1. A.Lifting state up — an in-memory representation of the UI that React diffs against to batch real DOM changes
2. B.Lifting state up — moving shared state to the closest common ancestor so sibling components stay in sync
3. C.Lifting state up — React's diffing of the new and previous element trees to compute the minimal set of DOM updates
4. D.Lifting state up — a higher-order component that skips re-rendering when a component's props are shallowly equal

Answer + AI explanation with Pro

1. A.using React.lazy with Suspense to code-split and load a component only when it is rendered
2. B.a higher-order component that skips re-rendering when a component's props are shallowly equal
3. C.a development tool that double-invokes certain functions to surface unsafe side effects
4. D.an in-memory representation of the UI that React diffs against to batch real DOM changes

Answer + AI explanation with Pro

1. A.React.memo
2. B.Lifting state up
3. C.Lazy loading
4. D.Strict Mode

Answer + AI explanation with Pro

1. A.Strict Mode — a development tool that double-invokes certain functions to surface unsafe side effects
2. B.Strict Mode — React's diffing of the new and previous element trees to compute the minimal set of DOM updates
3. C.Strict Mode — using React.lazy with Suspense to code-split and load a component only when it is rendered
4. D.Strict Mode — a higher-order component that skips re-rendering when a component's props are shallowly equal

Answer + AI explanation with Pro

1. A.a development tool that double-invokes certain functions to surface unsafe side effects
2. B.an in-memory representation of the UI that React diffs against to batch real DOM changes
3. C.using React.lazy with Suspense to code-split and load a component only when it is rendered
4. D.a higher-order component that skips re-rendering when a component's props are shallowly equal

Answer + AI explanation with Pro

1. A.React.memo
2. B.Strict Mode
3. C.Lifting state up
4. D.Lazy loading

Answer + AI explanation with Pro

1. A.Lazy loading — an in-memory representation of the UI that React diffs against to batch real DOM changes
2. B.Lazy loading — using React.lazy with Suspense to code-split and load a component only when it is rendered
3. C.Lazy loading — a development tool that double-invokes certain functions to surface unsafe side effects
4. D.Lazy loading — a higher-order component that skips re-rendering when a component's props are shallowly equal

Answer + AI explanation with Pro