ES6 debounce

debounce.js

export default function debounce(func, wait, immediate) {
  let timeout
  return function(...args) {
    clearTimeout(timeout)
    timeout = setTimeout(() => {
      timeout = null
      if (!immediate) func.apply(this, args)
    }, wait)
    if (immediate && !timeout) func.apply(this, [...args])
  }
}