CODE EXAMPLE FOR JAVASCRIPT

useEffect

useEffect(()=>{
  // It will run everytime  
})

// onMount 
useEffect(()=>{
  // It will run only one time  
},[]) 

// component didUpdate
useEffect(()=>{
  // it will run when dependency array change   
},[data])

// component willUnmount
useEffect(()=>{
  // for cleaning up the code
  return(()=>{
  })
})