onmount in react ho code example

Example 1: useeffect react

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

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

Example 2: componentdidmount in hooks

useEffect(() => {
  // Your code here
}, []);