HCL Infosystems Software Development Engineer Interview Questions and Answers

React Lifecycle methods are special methods that are invoked at different stages of a component's life cycle.

• Mounting: constructor, render, componentDidMount

• Updating: render, componentDidUpdate

• Unmounting: componentWillUnmount

• Error Handling: componentDidCatch

• Other methods: shouldComponentUpdate, getDerivedStateFromProps, getSnapshotBeforeUpdate

Class components are ES6 classes while functional components are functions.

• Class components have state and lifecycle methods while functional components don't.

• Functional components are simpler and easier to read and test.

• Functional components are preferred for simple UI components while class components are used for complex UI components.

• Functional components don't have 'this' keyword while class components do.

• Function

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