Pure Components in React are a way to optimize the performance of class components by preventing unnecessary re-renders. A React component is considered pure if it renders the same output for the same state and props. This means that if the component's state or props have not changed, the component will not re-render, thus saving on performance costs associated with rendering[1][2].
React provides the React.PureComponent base class for creating pure class components. When a class component extends React.PureComponent, it is treated as a pure component. This is because React.PureComponent automatically handles the shouldComponentUpdate() lifecycle method by performing a shallow comparison of the current props and state with the new ones. If there are no changes detected in the state or props, the shouldComponentUpdate() method returns false, preventing the component from re-rendering[1][2].
Here are some key points to remember about React Pure Components:
Shallow Comparison: Pure components perform a shallow comparison of the props and state during updates. If the objects passed as props or state have the same references, a re-render is prevented[1].
Performance Optimization: By preventing unnecessary re-renders when the data has not changed, pure components can lead to performance optimizations in a React application[1][2].
Automatic shouldComponentUpdate: Pure components automatically implement the shouldComponentUpdate() method with a shallow prop and state comparison, which can simplify the code and re...
