Vector4: Refactor clampScalar().

src/math/Vector4.js

@@ -471,27 +471,16 @@ Object.assign( Vector4.prototype, {
 
 	},
 
-	clampScalar: function () {
+	clampScalar: function ( minVal, maxVal ) {
 
-		var min, max;
+		this.x = Math.max( minVal, Math.min( maxVal, this.x ) );
+		this.y = Math.max( minVal, Math.min( maxVal, this.y ) );
+		this.z = Math.max( minVal, Math.min( maxVal, this.z ) );
+		this.w = Math.max( minVal, Math.min( maxVal, this.w ) );
 
-		return function clampScalar( minVal, maxVal ) {
-
-			if ( min === undefined ) {
-
-				min = new Vector4();
-				max = new Vector4();
-
-			}
-
-			min.set( minVal, minVal, minVal, minVal );
-			max.set( maxVal, maxVal, maxVal, maxVal );
-
-			return this.clamp( min, max );
-
-		};
+		return this;
 
-	}(),
+	},
 
 	clampLength: function ( min, max ) {