createTakeLastOneContext.js

/**
* createTakeLastOneContext - Returns a function that uses its context
* to know the last time it was called
* @returns {Function} takeLastOne function.
*/
function createTakeLastOneContext () {
  var _lastOne = 0,
    _timeStamp = 0;

  return function takeLastOne (callback) {
    var count = ++_lastOne,
      timeStamp = _timeStamp = (new Date()).getTime();

    /**
    * takeLastOne - Handles a callback function based on its knowledge
    * of times it was invoked before and only runs the last callback it was passed.
    * @returns {Function} callback function decorated with takeLastOne
    */
    return function () {
      var context = this,
        args = arguments;

      if (count === _lastOne && timeStamp === _timeStamp) {
        _lastOne = _timeStamp = 0;
        callback.apply(context, args);
      }
    };
  };
}