mimicing _.throttle

throttle.js

var _ = {};

_.throttle = function (func, wait, options) {
  var initial;

  return function () {
    if (!initial || new Date() - initial >= wait) {
      initial = new Date();
      func.apply(this, arguments);
    }
  };
}

var f = function (s) {
  console.log(s);
}

var throttledF = _.throttle(f, 10);
var i = 1;


throttledF(i++); // 1
throttledF(i++);
throttledF(i++);

setTimeout(function () {
  throttledF(i++); // 4
  throttledF(i++);
  throttledF(i++);
}, 5);

setTimeout(function () {
  throttledF(i++);
  throttledF(i++);
  throttledF(i++);
}, 10);

setTimeout(function () {
  throttledF(i++); // 10
  throttledF(i++);
  throttledF(i++);
}, 15);

setTimeout(function () {
  throttledF(i++); // 13
  throttledF(i++);
  throttledF(i++);
}, 20);