Better Timing Management

timing.js

/**
 * Created by jasonbyrne on 8/30/14.
 */

window.JCB = window.JCB || {};

JCB.Timing = (function(){
    // Self
    var me = {};
    // Private Properties
    var _timers = {},
        _lastTick = new Date().getTime(),
        _now = null,
        _animFrame = (function(){
            return  window.requestAnimationFrame       ||
                window.webkitRequestAnimationFrame ||
                window.mozRequestAnimationFrame    ||
                function( callback ){
                    window.setTimeout(callback, 1000 / 60);
                };
        })();
    // Private Methods
    var _tick = function() {
        _animFrame(_tick);
        _now = new Date().getTime();
        for (id in _timers) {
            _timers[id].diff = (_now - _timers[id].lastTick);
            if (_timers[id].interval <= _timers[id].diff) {
                _timers[id].count++;
                _timers[id].lastTick = _now;
                _timers[id].callback(_timers[id]);
                // If the reps have been expired
                if (
                    _timers[id].reps > 0 &&
                    _timers[id].count >= _timers[id].reps
                ) {
                    me.removeTimer(id);
                }
            }
        }
        _lastTick = _now;
        return me;
    };
    // Public methods
    me.addTimer = function(callback, interval, reps) {
        var id = new Date().getTime() + Math.random().toString(36).replace(/[^a-z]+/g, '').substr(0, 5);
        _timers[id] = {
            'id': id,
            'interval': interval,
            'callback': callback,
            'count': 0,
            'reps': reps || 0,
            'diff': 0,
            'lastTick': _lastTick
        };
        return id;
    };
    me.removeTimer = function(id) {
        delete _timers[id];
    };
    me.getTimer = function(id) {
        return _timers[id];
    };
    me.getLastTick = function() {
        return _lastTick;
    };
    // Done
    return _tick();
})();