score:70

Accepted answer

As G.aziz said, React.memo functions similarly to pure component. However, you can also adjust its behavior by passing it a function which defines what counts as equal. Basically, this function is shouldComponentUpdate, except you return true if you want it to not render.

const areEqual = (prevProps, nextProps) => true;

const MyComponent = React.memo(props => {
  return /*whatever jsx you like */
}, areEqual);

score:1

According to react documentation:- [https://reactjs.org/docs/react-api.html][1]

React. memo is a higher order component. If your component renders the same result given the same props, you can wrap it in a call to React. memo for a performance boost in some cases by memoizing the result. This means that React will skip rendering the component, and reuse the last rendered result.

For practical understanding I came across these two videos they are very good if you wanna clear concepts also, better to watch so it'll save your time.

Disclaimer:- This is not my YouTube channel.

score:7

We can use memo for prevent render in function components for optimization goal only. According React document:

This method only exists as a performance optimization. Do not rely on it to “prevent” a render, as this can lead to bugs.

score:17

React.memo is same thing as React.PureComponent

You can use it when you don't want to update a component that you think is static so, Same thing as PureCompoment.

For class Components:

class MyComponents extends React.PureCompoment {}

For function Components:

const Mycomponents = React.memo(props => {
  return <div> No updates on this component when rendering </div>;
});

So it's just creating a component with React.memo

To verify that your component doesn't render you can just activate HightlightUpdates in react extension and check your components reaction on rendering


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