/**
 * @see http://stackoverflow.com/a/7356528
 *
 * @param functionToCheck
 */
function isFunction(functionToCheck) {
    var getType = {};
    return functionToCheck && getType.toString.call(functionToCheck) == '[object Function]';
}


/**
 * @param arg
 */
function callback(arg) {
    if (isFunction(arg)) {
        return arg;
    }

    return function () {
        var obj = arg[0], method = arg[1];
        obj[method]();
    };
}



/**
 * Interval class
 */
var Interval = $class({
    constructor: function (listener, time) {
        this.callback = callback(listener);
        this.time = time;
        this.timeout = false;
    },
    start: function () {
        var me = this;
        this.timeout = setTimeout(function () {
            me.callback();
            me.start(); // next iteration
        }, this.time);
    },
    pause: function () {
        clearTimeout(this.timeout);
        this.timeout = false;
    }
});


var f = new Foo();
var i = new Interval([f, 'm'], 1000);
i.start();