/*

function loop(function () {
    return false; // to exit
}, 10[, cbArg1[, cbArg2]]);

var counter = 0;

loop(function () {
    console.log(counter++); 
    return counter < 10;
}, 300); // prints 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 and stop

*/
function loop(cb, period, _args) {
    var arg = Array.prototype.slice.call(arguments, 2);
    var interval = setInterval(function () {
        if (cb.apply(null, arg) === false) clearInterval(interval);
    } , period);
}

function clearIntervals() {
    var i = setInterval(function () {});
    while (i) clearInterval(i--);
}

(function (win) {
    var intervals = [];
    var _setInterval = setInterval;
    var _clearInterval = clearInterval;
    win.setInterval = function () {
        var id = _setInterval.apply(win, arguments);
        intervals.push(id);
        return id;
    };
    win.clearInterval = function (id) {
        _clearInterval.call(win, id);
        delete intervals[intervals.indexOf(id)];
    };
    win.getIntervals = function () {
        return Array.prototype.slice.call(intervals);
    };
    win.clearIntervals = function () {
        for (var i = 0; i < intervals.length; ++i) {
            clearInterval(intervals[i]);
        }
        intervals = [];
    }
})(window);