report function for IE debugging

array.extensions.js

@@ -20,4 +20,19 @@ Array.prototype.sum = function() {
  **/
 Array.prototype.clone = function() {
   return this.concat();
-}
+}
+
+/**
+ * Array#isUnique(value) -> Boolean
+ * returns true if a specified value is unique in an array 
+ * (or if it's not in an array)
+ *
+ *    [1,2,3].isUnique(1); // true
+ *    [1,2,3,1].isUnique(1); // false
+ *    [5,6,'a'].isUnique('foo'); // true
+ *
+ **/
+Array.prototype.isUnique = function(value){
+  var idx = this.indexOf(value);
+  return this.indexOf(value, idx + 1) == -1;
+};

experimental/report.js

@@ -0,0 +1,52 @@
+/* 
+  
+  Reports:
+    - number of event handlers on a page
+    - non-unique ID's
+    - collapsing names/ID's (IE bug)
+ 
+  Requires:
+    prototype.js v. 1.6.0.3
+
+*/
+
+function report() {
+  function isUnique(arr, value) {
+    var idx = arr.indexOf(value);
+    return arr.indexOf(value, idx + 1) == -1;
+  }
+  // event handlers
+  var results = 0, c = Event.cache;
+  for (var element in c) {
+    for (var handler in c[element]) {
+      for (var eventName in c[element]) {
+        if (eventName == 'element') continue;
+        results += c[element][eventName].length;
+      }
+    }
+  }
+  // find non-unique ids
+  var ids = $$('*').pluck('id').without('');
+  var nonUnique = [];
+  ids.each(function(id) {
+    if (!isUnique(ids, id))
+      (nonUnique.indexOf(id) == -1) && nonUnique.push(id);
+  })
+
+  // find collapsing names/ids (IE)
+  var withName = $$('*[name]');
+  var withId = $$('*[id]');
+  var collapsing = [];
+  withId.each(function(el) {
+    var collapsed = withName.find(function(_el){ return (_el.name == el.id) && _el != el })
+    if (collapsed) {
+      collapsing.push(el, collapsed);
+    }
+  });
+
+  // return result
+  return ['Event handlers: ', results, 
+          '\nNon-Unique ID\'s: ', (nonUnique.length ? nonUnique : 'none'), 
+          '\nCollapsing names/ID\'s: ', (collapsing.length ? collapsing : 'none')
+          ].join('');
+}