misc js utils

util.js

    util = {
        //calls a func every [timeout] ms for [stopMillis] ms.
        //returns a jQuery.Promise
        every: function (func, timeout, stopMillis, callnow) {
            function _every(func, timeout, absoluteStop, deferred) {
                if (new Date().getTime() >= absoluteStop) {
                    deferred.resolve();
                    return;
                }
                func();
                _.delay(function () { _every(func, timeout, absoluteStop, deferred); }, timeout);

            }

            var deferred = $.Deferred(),
                absoluteStop = new Date().getTime() + stopMillis,
                firstCall = function () { _every(func, timeout, absoluteStop, deferred); };
            
            callnow ? firstCall() : _.delay(firstCall, timeout);

            return deferred.promise();
        },

        //calls a func [times] times with a [timeout]ms delay
        //returns a jQuery.Promise
        times: function (func, timeout, times, callnow) {
            function _times(func, timeout, times, deferred) {
                if (times == 0) {
                    deferred.resolve();
                    return;
                }
                func();
                _delay(function () { _times(func, timeout, times - 1, deferred); }, timeout);

            }

            var deferred = $.Deferred(),
                firstCall = function () { _times(func, timeout, times, deferred); };

            callnow ? firstCall() : _.delay(firstCall, timeout);

            return deferred.promise();
        }
    };