Why does ShippingForm component in React still render when receiving the same props?

The rendering mechanism of React components is often confusing, especially when props value remains re-rendered. This article will explain why React components re-render even when receiving the same props , and how to optimize performance using React.memo .

By default, React components are re-rendered every time props or state changes. This mechanism ensures consistency between data and UI. However, this can also lead to unnecessary re-rendering and reduce application performance.

React.memo is a high-order component (HOC) that can be used to optimize the rendering performance of function components. React.memo prevents component from re-rendering when props value has not changed.

The reason your ShippingForm component is re-rendered even if props are the same is because it is not wrapped with React.memo . To solve this problem, just wrap ShippingForm component with React.memo :

 const ShippingForm = React.memo(function ShippingForm(props) {
  // Component logic});

In this way, the ShippingForm component will re-render only when props change, thereby improving application performance. React.memo is a simple and effective method of optimization, especially when dealing with large applications or performance-sensitive components. Remember, this only applies to function components. For class components, similar optimizations can be achieved using shouldComponentUpdate lifecycle method.

The above is the detailed content of Why does ShippingForm component in React still render when receiving the same props?. For more information, please follow other related articles on the PHP Chinese website!