utils: throttle, debounce

src/utils.js

@@ -0,0 +1,41 @@
+(function(window, undefined) {
+    /* Debounce and throttle functions taken from underscore.js */
+    window.debounce = function(func, wait, immediate) {
+        var timeout;
+        return function() {
+          var context = this, args = arguments;
+          var later = function() {
+            timeout = null;
+            if (!immediate) func.apply(context, args);
+          };
+          if (immediate && !timeout) func.apply(context, args);
+          clearTimeout(timeout);
+          timeout = setTimeout(later, wait);
+        };
+    };
+
+
+    window.throttle = function(func, wait) {
+        var context, args, timeout, throttling, more, result;
+        var whenDone = debounce(
+            function(){ more = throttling = false; }, wait);
+        return function() {
+          context = this; args = arguments;
+          var later = function() {
+            timeout = null;
+            if (more) func.apply(context, args);
+            whenDone();
+          };
+          if (!timeout) timeout = setTimeout(later, wait);
+          if (throttling) {
+            more = true;
+          } else {
+            result = func.apply(context, args);
+          }
+          whenDone();
+          throttling = true;
+          return result;
+        };
+    };
+
+})(window)