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What is React? React is a JavaScript library used to build interactive user interfaces for web applications. These React interview questions cover essential state behaviors, virtual DOM rendering, and hook optimizations.
The Virtual DOM is a lightweight, in-memory representation of the real DOM. When component state changes, React updates the Virtual DOM first, runs a diffing algorithm (Reconciliation) to identify changed elements, and batch updates only those elements in the real DOM, optimizing render performance.
useEffect without a dependency array executes after every render cycle. useEffect with an empty array `[]` runs once after the component mounts, mimicking componentDidMount. useEffect with variables in the dependency array runs only when those specific variables mutate.
React Hooks are special functions introduced in React 16.8 that allow functional components to manage local state, use lifecycle methods, and handle side effects. They resolve code sharing issues, eliminate the need for ES6 class syntax, and reduce component nesting.
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