Alamy Images Front end Developer Interview Questions and Answers

Pure component is a React component that does not re-render unless its props have changed.

• Pure components extend React.PureComponent class

• They implement shouldComponentUpdate method to compare props and state for changes

• Pure components are more efficient than regular components as they prevent unnecessary re-renders

Virtual DOM is a lightweight copy of the actual DOM that allows for efficient updates and rendering in web applications.

• Virtual DOM is a concept used in frameworks like React to improve performance by minimizing direct manipulation of the actual DOM.

• When changes are made to the virtual DOM, a comparison is done with the actual DOM to identify the minimal updates needed, reducing the number of DOM manipulations.

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