Why do you think it's better?

I don't use either Ruby or Python but I think that the first way is more natural.

Interesting. I model `array.join(',')` or the equivalent Py `','.join(l)` in my head as ultimately (pseudo-code):

    foldLeft(tail(array), str(head(elem)), (acc: String, elem: T) -> acc + ',' + str(elem))

Which makes the array method easier to understand than the string method. Funny how I thought it was _obvious_, but you find the opposite obvious.

Why? somearray is the important piece, the string is just a bit of spacing. Put the important thing first, don’t bury the lede.