How do you test for membership in AS3?

membershipTest.as

// option 1

private static const ABC:Object = {"a":null, "b":null, "c":null}

private function isABC(char:String):Boolean
{
    return char in ABC;
}

// option 2

private static const ABC:Vector.<String> = new <String>["a","b","c"];

private function isABC(char:String):Boolean
{
    return ABC.indexOf(char) != -1;
}

// option 3? - other than using an Array, assuming that the ABC list could grow so we're not going to hard-code values, what other options do we have?

Thanks for the feedback! I much prefer Dave's implementation with {"a":true, "b":true, "c":true} to #1. Always fun to ruminate on these details :)

Depends if speed is an issue. Object or dictionary access is going to be faster as its a hash map (thought i'm not sure about using "in"). Pretty sure indexOf just checks everything from the start index.