When is it appropriate to use a constructor in REACT?

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If you don’t initialize state and you don’t bind methods, you don’t need to implement a constructor for your React component.

The constructor for a React component is called before it is mounted. When implementing the constructor for a React.Component subclass, you should call super(props) before any other statement. Otherwise, this.props will be undefined in the constructor, which can lead to bugs.

Typically, in React constructors are only used for two purposes:

  • Initializing local state by assigning an object to this.state.
  • Binding event handler methods to an instance.

https://reactjs.org/docs/react-component.html#constructor

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