react use effect after mount code example

Example 1: use effect like component did mount

useEffect(() => {
	console.log('I am the new componentDidMount')
}, [])
// Don't forget the empty array at the end

Example 2: componentwillunmount hooks

useEffect(() => {
  window.addEventListener('mousemove', () => {});

  // returned function will be called on component unmount 
  return () => {
    window.removeEventListener('mousemove', () => {})
  }
}, [])