JavaScript Timer

gistfile1.js

Timer = function (timerFn, delay, intervalFn, interval) {
    /// <summary>Set a timer/timeout with Stop, Start, and Restart capability</summary>
    /// <param name="timerFn" type="Function">Function to run after the amount of time specified by the delay parameter</param>
    /// <param name="delay" type="Number">Amount of time to delay the timerFn</param>
    /// <param name="intervalFn" type="Function">Function to run after the interval specified in the interval parameter</param>
    /// <param name="interval" type="Number">Amount of time to run the intervalFn function (frequency)</param>

    var _self = this,
        _timerFn = timerFn,
        _delay = delay,
        _intervalFn = intervalFn,
        _interval = interval,
        _timeoutID = null,
        _intervaID = null;

    _self.Start = function () {
        /// <summary>Starts the Timer</summary>
        _timeoutID = setTimeout(_timerFn, _delay);
        if (_intervalFn !== undefined) {
            _intervaID = setInterval(_intervalFn, _interval);
        }
    }

    _self.Stop = function () {
        /// <summary>Stops the Timer</summary>
        clearTimeout(_timeoutID);
        if (_intervaID !== null) {
            clearInterval(_intervaID);
        }
    }

    _self.Restart = function () {
        /// <summary>Restarts the Timer</summary>
        _self.Stop();
        _self.Start();
    }
};