Irrational Exuberance

You are writing a comment about Writing Join in Erlang, here is a quick summary:

Erlang doesn't have a built in function for joining strings, and so I sat down to put one together quickly. A quick look at two different ways that join can be implemented.

You are responding to this comment written by Per Melin on May 5th 2008, 18:32.

But that was slower than the stdlib string implementation.

I wrote this, thinking it would be faster than the stdlib version:

join2([H|T], Sep) ->
          lists:concat([H|[P || X <- T, P <- [Sep, X]]]).
   

join3([], _Sep) -> [];
join3([T], _Sep) -> T;
join3([H|T], Sep) -> H ++ Sep ++ join3(T, Sep).
   

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@@ ruby
def a (b, c):
  b * c
end
@@

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