diff --git a/src/attributes.js b/src/attributes.js
index 4405b431..8d889fc9 100644
--- a/src/attributes.js
+++ b/src/attributes.js
@@ -4,6 +4,12 @@ jQuery.fn.extend({
 	},
 
 	addClass: function( value ) {
+    if(jQuery.isFunction(value)) {
+      return this.each(function() {
+        jQuery(this).addClass( value.call(this) );
+      });
+    }
+
 		if ( value && typeof value === "string" ) {
 			var classNames = (value || "").split(/\s+/);
 
@@ -29,6 +35,12 @@ jQuery.fn.extend({
 	},
 
 	removeClass: function( value ) {
+	  if(jQuery.isFunction(value)) {
+	    return this.each(function() {
+	      jQuery(this).removeClass( value.call(this) );
+	    });
+	  }
+
 		if ( (value && typeof value === "string") || value === undefined ) {
 			var classNames = (value || "").split(/\s+/);
 
@@ -113,7 +125,7 @@ jQuery.fn.extend({
 		// Typecast once if the value is a number
 		if ( typeof value === "number" ) {
 			value += '';
-		}	
+		}
 		var val = value;
 
 		return this.each(function(){
@@ -122,10 +134,10 @@ jQuery.fn.extend({
 				// Typecast each time if the value is a Function and the appended
 				// value is therefore different each time.
 				if( typeof val === "number" ) {
-					val += ''; 
+					val += '';
 				}
 			}
-			
+
 			if ( this.nodeType != 1 ) {
 				return;
 			}
@@ -158,6 +170,13 @@ jQuery.each({
 	},
 
 	toggleClass: function( classNames, state ) {
+	  if( jQuery.isFunction(classNames) ) {
+	    return this.each(function() {
+	      console.log(this);
+	      jQuery(this).toggleClass( classNames.call(this), state );
+	    });
+	  }
+
 		var type = typeof classNames;
 		if ( type === "string" ) {
 			// toggle individual class names
@@ -178,7 +197,11 @@ jQuery.each({
 		}
 	}
 }, function(name, fn){
-	jQuery.fn[ name ] = function(){
+	jQuery.fn[ name ] = function(val, state){
+	  if( jQuery.isFunction( val ) ) {
+	    return this.each(function() { jQuery(this)[ name ]( val.call(this), state ); });
+	  }
+
 		return this.each( fn, arguments );
 	};
 });
@@ -192,7 +215,7 @@ jQuery.extend({
 		if ( name in jQuery.fn && name !== "attr" ) {
 			return jQuery(elem)[name](value);
 		}
-		
+
 		var notxml = elem.nodeType !== 1 || !jQuery.isXMLDoc( elem ),
 			// Whether we are setting (or getting)
 			set = value !== undefined;
diff --git a/src/manipulation.js b/src/manipulation.js
index 930b3d9b..baab8c6c 100644
--- a/src/manipulation.js
+++ b/src/manipulation.js
@@ -32,6 +32,12 @@ if ( !jQuery.support.htmlSerialize ) {
 
 jQuery.fn.extend({
 	text: function( text ) {
+	  if(jQuery.isFunction(text)) {
+	    return this.each(function() {
+	      return jQuery(this).text( text.call(this) );
+	    });
+	  }
+
 		if ( typeof text !== "object" && text !== undefined ) {
 			return this.empty().append( (this[0] && this[0].ownerDocument || document).createTextNode( text ) );
 		}
@@ -87,7 +93,7 @@ jQuery.fn.extend({
 			}
 		}).end();
 	},
-	
+
 	append: function() {
 		return this.domManip(arguments, true, function(elem){
 			if ( this.nodeType === 1 ) {
diff --git a/test/unit/attributes.js b/test/unit/attributes.js
index e0425c46..a95b3f9c 100644
--- a/test/unit/attributes.js
+++ b/test/unit/attributes.js
@@ -1,5 +1,8 @@
 module("attributes");
 
+var bareObj = function(value) { return value; };
+var functionReturningObj = function(value) { return (function() { return value; }); };
+
 test("attr(String)", function() {
 	expect(28);
 	
@@ -294,10 +297,10 @@ test("attr('tabindex', value)", function() {
 	equals(element.attr('tabindex'), -1, 'set negative tabindex');
 });
 
-test("addClass(String)", function() {
+var testAddClass = function(valueObj) {
 	expect(2);
 	var div = jQuery("div");
-	div.addClass("test");
+	div.addClass( valueObj("test") );
 	var pass = true;
 	for ( var i = 0; i < div.size(); i++ ) {
 	 if ( div.get(i).className.indexOf("test") == -1 ) pass = false;
@@ -306,16 +309,24 @@ test("addClass(String)", function() {
 
 	// using contents will get regular, text, and comment nodes
 	var j = jQuery("#nonnodes").contents();
-	j.addClass("asdf");
+	j.addClass( valueObj("asdf") );
 	ok( j.hasClass("asdf"), "Check node,textnode,comment for addClass" );
+}
+
+test("addClass(String)", function() {
+  testAddClass(bareObj);
 });
 
-test("removeClass(String) - simple", function() {
+test("addClass(Function)", function() {
+  testAddClass(functionReturningObj);
+});
+
+var testRemoveClass = function(valueObj) {
 	expect(5);
 
 	var $divs = jQuery('div');
 
-	$divs.addClass("test").removeClass("test");
+	$divs.addClass("test").removeClass( valueObj("test") );
 
 	ok( !$divs.is('.test'), "Remove Class" );
 
@@ -323,7 +334,7 @@ test("removeClass(String) - simple", function() {
 	$divs = jQuery('div');
 
 	$divs.addClass("test").addClass("foo").addClass("bar");
-	$divs.removeClass("test").removeClass("bar").removeClass("foo");
+	$divs.removeClass( valueObj("test") ).removeClass( valueObj("bar") ).removeClass( valueObj("foo") );
 
 	ok( !$divs.is('.test,.bar,.foo'), "Remove multiple classes" );
 
@@ -331,42 +342,50 @@ test("removeClass(String) - simple", function() {
 	$divs = jQuery('div');
 
 	// Make sure that a null value doesn't cause problems
-	$divs.eq(0).addClass("test").removeClass(null);
+	$divs.eq(0).addClass("test").removeClass( valueObj(null) );
 	ok( $divs.eq(0).is('.test'), "Null value passed to removeClass" );
 
-	$divs.eq(0).addClass("test").removeClass("");
+	$divs.eq(0).addClass("test").removeClass( valueObj("") );
 	ok( $divs.eq(0).is('.test'), "Empty string passed to removeClass" );
 
 	// using contents will get regular, text, and comment nodes
 	var j = jQuery("#nonnodes").contents();
-	j.removeClass("asdf");
+	j.removeClass( valueObj("asdf") );
 	ok( !j.hasClass("asdf"), "Check node,textnode,comment for removeClass" );
+};
+
+test("removeClass(String) - simple", function() {
+  testRemoveClass(bareObj);
 });
 
-test("toggleClass(String|boolean|undefined[, boolean])", function() {
+test("removeClass(Function) - simple", function() {
+  testRemoveClass(functionReturningObj);
+});
+
+var testToggleClass = function(valueObj) {
 	expect(17);
 
 	var e = jQuery("#firstp");
 	ok( !e.is(".test"), "Assert class not present" );
-	e.toggleClass("test");
+	e.toggleClass( valueObj("test") );
 	ok( e.is(".test"), "Assert class present" );
-	e.toggleClass("test");
+	e.toggleClass( valueObj("test") );
 	ok( !e.is(".test"), "Assert class not present" );
 
 	// class name with a boolean
-	e.toggleClass("test", false);
+	e.toggleClass( valueObj("test"), false );
 	ok( !e.is(".test"), "Assert class not present" );
-	e.toggleClass("test", true);
+	e.toggleClass( valueObj("test"), true );
 	ok( e.is(".test"), "Assert class present" );
-	e.toggleClass("test", false);
+	e.toggleClass( valueObj("test"), false );
 	ok( !e.is(".test"), "Assert class not present" );
 
 	// multiple class names
 	e.addClass("testA testB");
 	ok( (e.is(".testA.testB")), "Assert 2 different classes present" );
-	e.toggleClass("testB testC");
+	e.toggleClass( valueObj("testB testC") );
 	ok( (e.is(".testA.testC") && !e.is(".testB")), "Assert 1 class added, 1 class removed, and 1 class kept" );
-	e.toggleClass("testA testC");
+	e.toggleClass( valueObj("testA testC") );
 	ok( (!e.is(".testA") && !e.is(".testB") && !e.is(".testC")), "Assert no class present" );
 
 	// toggleClass storage
@@ -393,11 +412,27 @@ test("toggleClass(String|boolean|undefined[, boolean])", function() {
 	// Cleanup
 	e.removeClass("testD");
 	e.removeData('__className__');
+};
+
+test("toggleClass(String|boolean|undefined[, boolean])", function() {
+  testToggleClass(bareObj);
 });
 
-test("removeAttr(String", function() {
+test("toggleClass(Function[, boolean])", function() {
+  testToggleClass(functionReturningObj);
+});
+
+var testRemoveAttr = function(valueObj) {
 	expect(1);
-	equals( jQuery('#mark').removeAttr("class")[0].className, "", "remove class" );
+	equals( jQuery('#mark').removeAttr( valueObj("class") )[0].className, "", "remove class" );
+};
+
+test("removeAttr(String)", function() {
+  testRemoveAttr(bareObj);
+});
+
+test("removeAttr(Function)", function() {
+  testRemoveAttr(functionReturningObj);
 });
 
 test("addClass, removeClass, hasClass", function() {
diff --git a/test/unit/manipulation.js b/test/unit/manipulation.js
index 6de3e14e..8c3d1a55 100644
--- a/test/unit/manipulation.js
+++ b/test/unit/manipulation.js
@@ -739,15 +739,16 @@ test("html(String)", function() {
 
 test("html(Function)", function() {
 	testHtml(functionReturningObj);
-})
+});
 
 var testText = function(valueObj) {
 	expect(4);
-	equals( jQuery("#foo").text("<div><b>Hello</b> cruel world!</div>")[0].innerHTML.replace(/>/g, "&gt;"), "&lt;div&gt;&lt;b&gt;Hello&lt;/b&gt; cruel world!&lt;/div&gt;", "Check escaped text" );
+	var val = valueObj("<div><b>Hello</b> cruel world!</div>");
+	equals( jQuery("#foo").text(val)[0].innerHTML.replace(/>/g, "&gt;"), "&lt;div&gt;&lt;b&gt;Hello&lt;/b&gt; cruel world!&lt;/div&gt;", "Check escaped text" );
 
 	// using contents will get comments regular, text, and comment nodes
 	var j = jQuery("#nonnodes").contents();
-	j.text("hi!");
+	j.text(valueObj("hi!"));
 	equals( jQuery(j[0]).text(), "hi!", "Check node,textnode,comment with text()" );
 	equals( j[1].nodeValue, " there ", "Check node,textnode,comment with text()" );
 	equals( j[2].nodeType, 8, "Check node,textnode,comment with text()" );