Return array of unique elements

uniques.as

private function returnArrayOfUniqueElements(originalArray:Array):Array {
            var arrayOfUniqueElements:Array = new Array();
            var duplicateCheckerObject:Object = new Object();

            for (var i:uint = 0; i < originalArray.length; i++) {
                var stringToCheckFor:String = originalArray[i];

                if (!duplicateCheckerObject[stringToCheckFor]) {
                    arrayOfUniqueElements.push(stringToCheckFor);
                    duplicateCheckerObject[stringToCheckFor] = true;
                }
            }
            return arrayOfUniqueElements;
        }