[erlang-questions] Erlang shows its slow face!
Tue Nov 16 16:34:28 CET 2010
On Wed, 17 Nov 2010 01:20:51 +1100, Kostis Sagonas <kostis@REDACTED>
> There are two basic issues here:
> (1) The Erlang compiler doesn't really handle list comprehension as
> native loops; it compiles list comprehensions to recursive
> functions. lists:seq(1, N) is not special syntax -- unlike Haskell
> and almost surely builds an actual list.
> Yes. This is an issue. Actually, it's more general: in my experience
> most Erlang programmers do not understand the difference between list
> comprehensions and lists:foreach/2. Many of them find list comprehension
> notation so nice that they often use it in places where building the
> list is not only is not their intention but is completely unnecessary.
> The compiler is not sufficiently clever to perform deforestation and
> avoid construction of intermediate lists.
First I'm hearing of this. It really ought to be in one of those green
boxes in the documentation.
- Edmond -
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