React Component Composition and Props Questions
Covers designing and building reusable, composable React components using props to pass data and callbacks. Includes understanding prop drilling and strategies to avoid it, controlled versus uncontrolled components, prop validation and type checking, the children prop, render prop and higher order component patterns, and when to split or combine components for clarity and reuse. Emphasizes component hierarchy design, interface stability, handling default and optional props, passing event handlers, and when to use context or other patterns instead of deep prop passing.
HardTechnical
48 practiced
Implement (or outline) a higher-order component `withData` that injects fetched data as a prop into a wrapped component. Explain how you would preserve static methods and forward refs from the wrapper to the wrapped component, and name any utilities you'd use to help (e.g., hoist-non-react-statics).
EasyTechnical
52 practiced
Show how a parent component should pass an event handler to a child button component and explain best practices to avoid unnecessary re-renders (e.g., binding in render). Provide a small code example in React functional components illustrating a parent `onToggle` passed to `<ToggleButton onToggle={...} />`.
EasyTechnical
53 practiced
What is React.memo and how does it affect component re-rendering? Provide an example of wrapping a pure functional component with `React.memo` and explain one scenario where `React.memo` would not prevent re-renders even if props appear unchanged.
EasyTechnical
52 practiced
How and why would you use the `prop-types` package in a plain JavaScript React project? Show a small example that declares a prop as required and one that has a default value. Mention when you might remove `prop-types` in favor of TypeScript.
EasyTechnical
56 practiced
Explain the render prop pattern and give a small example of a `MouseTracker` component that accepts a `render` prop function which receives mouse coordinates and returns JSX. When is a render prop preferable to children or HOCs?
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