React Component Lifecycle - componentWillUnmount

The componentWillUnmount life-cycle method will be called when a component is being removed from DOM. This method can be used to perform any required cleanup operation like cancelling pending network requests, cancelling subscriptions etc.

This is the only life-cycle method invoked in the component un-mounting phase.

Below is the syntax for componentWillUnmount

componentWillUnmount() {
  // perform cleanup operation here.
}