Throttle function in javascript with the example

throttle_fn.js

function throttle (func, delay, watch) {
  watch && clearTimeout(watch);
  return setTimeout(func, delay)
}

function callSearchApi(v) {
 console.log(v);
}



let timeout = null;

const onUserType = value => {
  timeout = throttle(
    () => callSearchApi(value), 300, timeout  
  )
}


const inpt = document.getElementById('userInput');

inpt.addEventListener('keyup', e => {
  onUserType(e.target.value);
});