jquery core: Closes #2827. jQuery.each iterates over functions

src/core.js

@@ -307,10 +307,12 @@ jQuery.extend({
 
 	// args is for internal usage only
 	each: function( object, callback, args ) {
-		var name, i = 0, length = object.length;
+		var name, i = 0, 
+			length = object.length,
+			isObj = length === undefined || jQuery.isFunction(object);
 
 		if ( args ) {
-			if ( length === undefined ) {
+			if ( isObj ) {
 				for ( name in object ) {
 					if ( callback.apply( object[ name ], args ) === false ) {
 						break;
@@ -326,7 +328,7 @@ jQuery.extend({
 
 		// A special, fast, case for the most common use of each
 		} else {
-			if ( length === undefined ) {
+			if ( isObj ) {
 				for ( name in object ) {
 					if ( callback.call( object[ name ], name, object[ name ] ) === false ) {
 						break;

test/unit/core.js

@@ -494,7 +494,7 @@ test("jQuery.extend(Object, Object)", function() {
 });
 
 test("jQuery.each(Object,Function)", function() {
-	expect(12);
+	expect(13);
 	jQuery.each( [0,1,2], function(i, n){
 		equals( i, n, "Check array iteration" );
 	});
@@ -519,6 +519,13 @@ test("jQuery.each(Object,Function)", function() {
 	total = 0;
 	jQuery.each({"a":3,"b":3,"c":3}, function(i,v){ total += v; return false; });
 	equals( total, 3, "Looping over an object, with break" );
+
+	var f = function(){};
+	f.foo = 'bar';
+	jQuery.each(f, function(i){
+		f[i] = 'baz';
+	});
+	equals( "baz", f.foo, "Loop over a function" );
 });
 
 test("jQuery.makeArray", function(){