Avoid jQuery(this) and a closure for .toggle(Boolean), close gh-1271.

(cherry picked from commit e53a9190)

src/attributes.js

@@ -111,8 +111,11 @@ jQuery.fn.extend({
 	},
 
 	toggleClass: function( value, stateVal ) {
-		var type = typeof value,
-			isBool = typeof stateVal === "boolean";
+		var type = typeof value;
+
+		if ( typeof stateVal === "boolean" && type === "string" ) {
+			return stateVal ? this.addClass( value ) : this.removeClass( value );
+		}
 
 		if ( jQuery.isFunction( value ) ) {
 			return this.each(function( i ) {
@@ -126,13 +129,15 @@ jQuery.fn.extend({
 				var className,
 					i = 0,
 					self = jQuery( this ),
-					state = stateVal,
 					classNames = value.match( core_rnotwhite ) || [];
 
 				while ( (className = classNames[ i++ ]) ) {
 					// check each className given, space separated list
-					state = isBool ? state : !self.hasClass( className );
-					self[ state ? "addClass" : "removeClass" ]( className );
+					if ( self.hasClass( className ) ) {
+						self.removeClass( className );
+					} else {
+						self.addClass( className );
+					}
 				}
 
 			// Toggle whole class name

src/css.js

@@ -134,10 +134,12 @@ jQuery.fn.extend({
 		return showHide( this );
 	},
 	toggle: function( state ) {
-		var bool = typeof state === "boolean";
+		if ( typeof state === "boolean" ) {
+			return state ? this.show() : this.hide();
+		}
 
 		return this.each(function() {
-			if ( bool ? state : isHidden( this ) ) {
+			if ( isHidden( this ) ) {
 				jQuery( this ).show();
 			} else {
 				jQuery( this ).hide();