[captainmuon]

Sure, I know. What I actually mean is that I don't grok curried functions.

Does join(a)(b) mean join(a, b) or join(b, a)? Does it mean a.join(b) or b.join(a)? And is a or b the delimiter? I don't really feel confident without looking it up or trying it out. I have a similar problem with Haskell's function syntax a -> a -> a.

If the function was called makeJoinerBy(sep)(array), it would be somewhat clearer:

    join = makeJoinerBy(' ')
    result = join(array)