[erlang-questions] Erlang again!
黃耀賢 (Yau-Hsien Huang)
Thu Jul 22 19:09:08 CEST 2010
On Fri, Jul 23, 2010 at 12:55 AM, Boris Mühmer <
> 2010/7/22 Masklinn <>:
> > What you want here is zip/2 or, even better, zipWith/3.
> sub(L2,L1) ->
> sub(,,List) ->
> sub([H2|T2],[H1|T1],List) ->
> Ok, this is much longer than with zip or zipwith, but somehow this was
> much easier to "develop". Well, at the end of the documentation of
> zipwith there is almost a solution to the problem, but I wouldn't have
> found it, if zip or zipwith wasn't mentioned.
> Is such a solution plain bad, or just a newbie mistake/error?
> - boris
It's not bad. It's a technique that is not related to what zip/2 or
means, but it is a general way to make tail-recursion by using a
accumulating parameter. It's an important programming strategy for
a newbie to become familiar with Erlang or functional programming.
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