Debounce function.

debounce.js

function debounce (func, wait = 100, immediate) {
  let timeout

  return function () {
    const context = this
    const args = arguments

    const later = function () {
      timeout = null
      if (!immediate) func.apply(context, args)
    }

    const callNow = immediate && !timeout

    clearTimeout(timeout)

    timeout = setTimeout(later, wait)

    if (callNow) func.apply(context, args)
  }
}

export default debounce