Equivalent of ng-init in reactjs

Question

I am converting my project from angular to reactjs. But I got stuck at ng-init. I don't know what is the equivalent of ng-init in reactjs in react way. Please help me, anyone, with this.

Answer 1

Use componentDidMount for class component

  componentDidMount() {
    ...
  }

The componentDidMount() method runs after the component output has been rendered to the DOM.

and use useeffect for the functional component

useEffect(() => {
 ...
});

Answer 2

If you're using class based components then its equivalent is ComponentWillMount() and if you're using function based component then it can be done in useEffect() hook provided by React.