Query now throws no warnings under strict mode in Firefox (ticket #922). In fixing this, revision [1771] was discovered and reverted (no API changes are being added in at this time), and a couple un-functioning test cases were fixed (array comparisions were being done for objects).

build/test/data/testrunner.js

@@ -171,7 +171,7 @@ function ok(a, msg) {
  */
 function isSet(a, b, msg) {
 	var ret = true;
-	if ( a && b && a.length == b.length ) {
+	if ( a && b && a.length != undefined && a.length == b.length ) {
 		for ( var i = 0; i < a.length; i++ )
 			if ( a[i] != b[i] )
 				ret = false;
@@ -183,8 +183,30 @@ function isSet(a, b, msg) {
 		_config.Test.push( [ ret, msg ] );
 }
 
+/**
+ * Asserts that two objects are equivalent
+ */
+function isObj(a, b, msg) {
+	var ret = true;
+	
+	if ( a && b ) {
+		for ( var i in a )
+			if ( a[i] != b[i] )
+				ret = false;
+
+		for ( i in b )
+			if ( a[i] != b[i] )
+				ret = false;
+	} else
+		ret = false;
+
+    _config.Test.push( [ ret, msg ] );
+}
+
 function serialArray( a ) {
 	var r = [];
+	
+	if ( a && a.length )
         for ( var i = 0; i < a.length; i++ ) {
             var str = a[i].nodeName;
             if ( str ) {

src/event/event.js

@@ -129,7 +129,7 @@ jQuery.event = {
 
 		// Handle triggering a single element
 		else {
-			var val, ret, fn = jQuery.isFunction( element[ type ] );
+			var val, ret, fn = jQuery.isFunction( element[ type ] || null );
 			
 			// Pass along a fake event
 			data.unshift( this.fix({ type: type, target: element }) );
@@ -146,19 +146,18 @@ jQuery.event = {
 	},
 
 	handle: function(event) {
+		// returned undefined or false
+		var val;
+		
 		// Handle the second event of a trigger and when
 		// an event is called after a page has unloaded
-		if ( typeof jQuery == "undefined" || jQuery.event.triggered ) return;
+		if ( typeof jQuery == "undefined" || jQuery.event.triggered )
+		  return val;
 
 		// Empty object is for triggered events with no data
 		event = jQuery.event.fix( event || window.event || {} ); 
 
-		// returned undefined or false
+		var c = this.$events[event.type], args = [].slice.call( arguments, 1 );
-		var returnValue;
-
-		var c = this.$events[event.type];
-
-		var args = [].slice.call( arguments, 1 );
 		args.unshift( event );
 
 		for ( var j in c ) {
@@ -170,14 +169,16 @@ jQuery.event = {
 			if ( c[j].apply( this, args ) === false ) {
 				event.preventDefault();
 				event.stopPropagation();
-				returnValue = false;
+				val = false;
 			}
 		}
 
 		// Clean up added properties in IE to prevent memory leak
-		if (jQuery.browser.msie) event.target = event.preventDefault = event.stopPropagation = event.handler = event.data = null;
+		if (jQuery.browser.msie)
+			event.target = event.preventDefault = event.stopPropagation =
+				event.handler = event.data = null;
 
-		return returnValue;
+		return val;
 	},
 
 	fix: function(event) {
@@ -415,7 +416,7 @@ jQuery.fn.extend({
 
 		return this.click(function(e) {
 			// Figure out which function to execute
-			this.lastToggle = this.lastToggle == 0 ? 1 : 0;
+			this.lastToggle = 0 == this.lastToggle ? 1 : 0;
 			
 			// Make sure that clicks stop
 			e.preventDefault();

src/jquery/coreTest.js

@@ -363,7 +363,7 @@ test("append(String|Element|Array<Element>|jQuery)", function() {
 	ok( $('#select3').append('<option value="appendTest">Append Test</option>').find('option:last-child').attr('value') == 'appendTest', 'Appending html options to select element');
 	
 	reset();
-	expected = "This link has class=\"blog\": Simon Willison's WeblogTry them out:";
+	var expected = "This link has class=\"blog\": Simon Willison's WeblogTry them out:";
 	$('#sap').append(document.getElementById('first'));
 	ok( expected == $('#sap').text(), "Check for appending of element" );
 	
@@ -422,7 +422,7 @@ test("appendTo(String|Element|Array&lt;Element&gt;|jQuery)", function() {
 	ok( $('<option value="appendTest">Append Test</option>').appendTo('#select3').parent().find('option:last-child').attr('value') == 'appendTest', 'Appending html options to select element');
 	
 	reset();
-	expected = "This link has class=\"blog\": Simon Willison's WeblogTry them out:";
+	var expected = "This link has class=\"blog\": Simon Willison's WeblogTry them out:";
 	$(document.getElementById('first')).appendTo('#sap');
 	ok( expected == $('#sap').text(), "Check for appending of element" );
 	
@@ -449,7 +449,7 @@ test("prepend(String|Element|Array&lt;Element&gt;|jQuery)", function() {
 	ok( $('#select3').prepend('<option value="prependTest">Prepend Test</option>').find('option:first-child').attr('value') == 'prependTest', 'Prepending html options to select element');
 	
 	reset();
-	expected = "Try them out:This link has class=\"blog\": Simon Willison's Weblog";
+	var expected = "Try them out:This link has class=\"blog\": Simon Willison's Weblog";
 	$('#sap').prepend(document.getElementById('first'));
 	ok( expected == $('#sap').text(), "Check for prepending of element" );
 
@@ -472,7 +472,7 @@ test("prependTo(String|Element|Array&lt;Element&gt;|jQuery)", function() {
 	ok( $('<option value="prependTest">Prepend Test</option>').prependTo('#select3').parent().find('option:first-child').attr('value') == 'prependTest', 'Prepending html options to select element');
 	
 	reset();
-	expected = "Try them out:This link has class=\"blog\": Simon Willison's Weblog";
+	var expected = "Try them out:This link has class=\"blog\": Simon Willison's Weblog";
 	$(document.getElementById('first')).prependTo('#sap');
 	ok( expected == $('#sap').text(), "Check for prepending of element" );
 
@@ -637,8 +637,8 @@ test("$.extend(Object, Object)", function() {
 		optionsCopy = { xnumber2: 1, xstring2: "x", xxx: "newstring" },
 		merged = { xnumber1: 5, xnumber2: 1, xstring1: "peter", xstring2: "x", xxx: "newstring" };
 	jQuery.extend(settings, options);
-	isSet( settings, merged, "Check if extended: settings must be extended" );
+	isObj( settings, merged, "Check if extended: settings must be extended" );
-	isSet ( options, optionsCopy, "Check if not modified: options must not be modified" );
+	isObj( options, optionsCopy, "Check if not modified: options must not be modified" );
 });
 
 test("$.extend(Object, Object, Object, Object)", function() {
@@ -651,10 +651,10 @@ test("$.extend(Object, Object, Object, Object)", function() {
 		options2Copy = { xstring2: "xx", xxx: "newstringx" },
 		merged = { xnumber1: 5, xnumber2: 1, xstring1: "peter", xstring2: "xx", xxx: "newstringx" };
 	var settings = jQuery.extend({}, defaults, options1, options2);
-	isSet( settings, merged, "Check if extended: settings must be extended" );
+	isObj( settings, merged, "Check if extended: settings must be extended" );
-	isSet ( defaults, defaultsCopy, "Check if not modified: options1 must not be modified" );
+	isObj( defaults, defaultsCopy, "Check if not modified: options1 must not be modified" );
-	isSet ( options1, options1Copy, "Check if not modified: options1 must not be modified" );
+	isObj( options1, options1Copy, "Check if not modified: options1 must not be modified" );
-	isSet ( options2, options2Copy, "Check if not modified: options2 must not be modified" );
+	isObj( options2, options2Copy, "Check if not modified: options2 must not be modified" );
 });
 
 test("val()", function() {

src/jquery/jquery.js

@@ -840,7 +840,7 @@ jQuery.fn = jQuery.prototype = {
 	 */
 	clone: function(deep) {
 		return this.pushStack( jQuery.map( this, function(a){
-			var a = a.cloneNode( deep != undefined ? deep : true );
+			a = a.cloneNode( deep != undefined ? deep : true );
 			a.$events = null; // drop $events expando to avoid firing incorrect events
 			return a;
 		}) );
@@ -1178,10 +1178,6 @@ jQuery.fn = jQuery.prototype = {
  * Extend one object with one or more others, returning the original,
  * modified, object. This is a great utility for simple inheritance.
  * 
- * There is also an optional collision resolution function. Any time the target and
- * merged object both contain a key this function is called. This may be used to create
- * a recursive merge. (See example) Unless you know what this is, you probably don't care.
- * 
  * @example var settings = { validate: false, limit: 5, name: "foo" };
  * var options = { validate: true, name: "bar" };
  * jQuery.extend(settings, options);
@@ -1194,19 +1190,8 @@ jQuery.fn = jQuery.prototype = {
  * @result settings == { validate: true, limit: 5, name: "bar" }
  * @desc Merge defaults and options, without modifying the defaults
  *
- * @example var defaults = { validate: false, limit: 5, name: "foo", nested: {depth: false} };
- * var options = { validate: true, name: "bar", nested: {depth: true} };
- * var collision_resolver_fn = function(target, mergee) {
- *   // combine nested Objects, in this case the object being merged takes priority
- *   return jQuery.extend({}, target, mergee);
- * }
- * var settings = jQuery.extend({}, collision_resolver_fn, defaults, options);
- * @result settings == { validate: true, limit: 5, name: "bar" }
- * @desc Recursively merge defaults and options, without modifying the defaults
- *
  * @name $.extend
  * @param Object target The object to extend
- * @param Function (optional) collision resolution function. Hook to extend the merging behavior of $.extend(). See example.
  * @param Object prop1 The object that will be merged into the first.
  * @param Object propN (optional) More objects to merge into the first
  * @type Object
@@ -1214,26 +1199,17 @@ jQuery.fn = jQuery.prototype = {
  */
 jQuery.extend = jQuery.fn.extend = function() {
 	// copy reference to target object
-	var resolver, prop, target = arguments[0],
+	var target = arguments[0], a = 1;
-		a = 1;
 
 	// extend jQuery itself if only one argument is passed
 	if ( arguments.length == 1 ) {
 		target = this;
 		a = 0;
-	} else if (jQuery.isFunction(arguments[a])) {
-	  resolver = arguments[a++];
 	}
-
+	var prop;
-	while (prop = arguments[a++])
+	while ( (prop = arguments[a++]) != null )
 		// Extend the base object
-		for ( var i in prop ) {
+		for ( var i in prop ) target[i] = prop[i];
-		  if (resolver && target[i] && prop[i]) {
-		    target[i] = resolver(target[i], prop[i]);
-	    } else {
-		    target[i] = prop[i];
-		  }
-	  }
 
 	// Return the modified object
 	return target;
@@ -1528,7 +1504,7 @@ jQuery.extend({
 				arg = jQuery.makeArray( div.childNodes );
 			}
 
-			if ( arg.length === 0 && !jQuery(arg).is("form, select") )
+			if ( 0 === arg.length && !jQuery(arg).is("form, select") )
 				return;
 
 			if ( arg[0] == undefined || jQuery(arg).is("form, select") )
@@ -1663,7 +1639,7 @@ jQuery.extend({
 		var r = [], num = jQuery.mergeNum++;
 
 		for ( var i = 0, fl = first.length; i < fl; i++ )
-			if ( first[i].mergeNum != num ) {
+			if ( num != first[i].mergeNum ) {
 				first[i].mergeNum = num;
 				r.push(first[i]);
 			}

src/selector/selector.js

@@ -27,8 +27,8 @@ jQuery.extend({
 			contains: "jQuery.fn.text.apply([a]).indexOf(m[3])>=0",
 
 			// Visibility
-			visible: 'a.type!="hidden"&&jQuery.css(a,"display")!="none"&&jQuery.css(a,"visibility")!="hidden"',
+			visible: '"hidden"!=a.type&&jQuery.css(a,"display")!="none"&&jQuery.css(a,"visibility")!="hidden"',
-			hidden: 'a.type=="hidden"||jQuery.css(a,"display")=="none"||jQuery.css(a,"visibility")=="hidden"',
+			hidden: '"hidden"==a.type||jQuery.css(a,"display")=="none"||jQuery.css(a,"visibility")=="hidden"',
 
 			// Form attributes
 			enabled: "!a.disabled",
@@ -37,15 +37,15 @@ jQuery.extend({
 			selected: "a.selected||jQuery.attr(a,'selected')",
 
 			// Form elements
-			text: "a.type=='text'",
+			text: "'text'==a.type",
-			radio: "a.type=='radio'",
+			radio: "'radio'==a.type",
-			checkbox: "a.type=='checkbox'",
+			checkbox: "'checkbox'==a.type",
-			file: "a.type=='file'",
+			file: "'file'==a.type",
-			password: "a.type=='password'",
+			password: "'password'==a.type",
-			submit: "a.type=='submit'",
+			submit: "'submit'==a.type",
-			image: "a.type=='image'",
+			image: "'image'==a.type",
-			reset: "a.type=='reset'",
+			reset: "'reset'==a.type",
-			button: 'a.type=="button"||jQuery.nodeName(a,"button")',
+			button: '"button"==a.type||jQuery.nodeName(a,"button")',
 			input: "/input|select|textarea|button/i.test(a.nodeName)"
 		},
 		".": "jQuery.className.has(a,m[2])",
@@ -62,7 +62,7 @@ jQuery.extend({
 			_resort: function(m){
 				return ["", m[1], m[3], m[2], m[5]];
 			},
-			_prefix: "z=a[m[3]];if(!z||/href|src/.test(m[3]))z=jQuery.attr(a,m[3]);"
+			_prefix: "var z=a[m[3]];if(!z||/href|src/.test(m[3]))z=jQuery.attr(a,m[3]);"
 		},
 		"[": "jQuery.find(m[2],a).length"
 	},
@@ -194,7 +194,7 @@ jQuery.extend({
 				// Handle multiple expressions
 				if ( !t.indexOf(",") ) {
 					// Clean the result set
-					if ( ret[0] == context ) ret.shift();
+					if ( context == ret[0] ) ret.shift();
 
 					// Merge the result sets
 					done = jQuery.merge( done, ret );
@@ -292,7 +292,7 @@ jQuery.extend({
 			ret = [];
 
 		// Remove the root context
-		if ( ret && ret[0] == context )
+		if ( ret && context == ret[0] )
 			ret.shift();
 
 		// And combine the results
@@ -408,8 +408,9 @@ jQuery.extend({
 		for ( ; cur; cur = cur[dir] ) {
 			if ( cur.nodeType == 1 ) num++;
 			if ( num == result || result == "even" && num % 2 == 0 && num > 1 && cur == elem ||
-				result == "odd" && num % 2 == 1 && cur == elem ) return cur;
+				result == "odd" && num % 2 == 1 && cur == elem ) break;
 		}
+		return cur;
 	},
 	
 	/**