Throttle Function

_Throttle.js

function throttle(cb, delay = 1000) {
  let shouldWait = false
  let waitingArgs
  const timeoutFunc = () => {
    if (waitingArgs == null) {
      shouldWait = false
    } else {
      cb(...waitingArgs)
      waitingArgs = null
      setTimeout(timeoutFunc, delay)
    }
  }

  return (...args) => {
    if (shouldWait) {
      waitingArgs = args
      return
    }

    cb(...args)
    shouldWait = true

    setTimeout(timeoutFunc, delay)
  }
}