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debounce: function (fn, delay) {
                var timer = null;
                return function () {
                    var context = this, args = arguments;
                    clearTimeout(timer);
                    timer = setTimeout(function () {
                        fn.apply(context, args);
                    }, delay);
                };
            }
            
            throttle: function (fn, threshhold, scope) {
                threshhold || (threshhold = 250);
                var last,
                    deferTimer;
                return function () {
                    var context = scope || this;

                    var now = +new Date,
                        args = arguments;
                    if (last && now < last + threshhold) {
                        // hold on to it
                        clearTimeout(deferTimer);
                        deferTimer = setTimeout(function () {
                            last = now;
                            fn.apply(context, args);
                        }, threshhold);
                    } else {
                        last = now;
                        fn.apply(context, args);
                    }
                };
      }