Because now the type of join is an argument on the "join" operation, and join is the first word of that statement making it more obvious what the operation actu

Because now the type of join is an argument on the "join" operation, and join is the first word of that statement making it more obvious what the operation actually is? I also prefer foo(bar) over "bar to foo()" as well, which seems like the equivalent in a more general purpose function call in a language example.