Another way to support Mark in other languages, is just to use map for both properties and contents. E.g. in Java, the key in map can be integer. Of course, the

Another way to support Mark in other languages, is just to use map for both properties and contents. E.g. in Java, the key in map can be integer. Of course, the performance will not be as good as primitive array. But it can be one man's quick-and-dirty solution. General JS arrays (not those TypedArrays) are actually maps indeed.