smooth-progress/lib/throttle.js

pixel-by-pixel CLI progress bar

'use strict'

function throttle (fn, threshhold, scope) {
  threshhold || (threshhold = 250)
  var last,
    deferTimer
  return function () {
    var context = scope || this

    var now = +new Date()
    var args = arguments
    if (last && now < last + threshhold) {
      // hold on to it
      clearTimeout(deferTimer)
      deferTimer = setTimeout(function () {
        last = now
        fn.apply(context, args)
      }, threshhold)
    } else {
      last = now
      fn.apply(context, args)
    }
  }
}

module.exports = throttle