[erlang-bugs] error in R12B Efficiency Guide

Bjorn Gustavsson <>
Mon Jan 28 11:56:00 CET 2008


Thanks! I have now corrected this embarrassing mistake.

/Bjorn

"Ulf Wiger (TN/EAB)" <> writes:

> Has this been reported already?
> 
> http://www.erlang.org/doc/efficiency_guide/part_frame.html
> 
> Under Common Caveats, 3.4 length/1:
> 
> "foo(L) when length(L) >= 3 ->
>      ...
> 
> can be rewritten to
> 
> foo([_,_,_]=L) ->
>     ..."
> 
> The two declarations are of course not equivalent.
> The alternative should rather be:
> 
> foo([_,_,_|_] = L) ->
>     ...
> 
> BR,
> Ulf W
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> 
> http://www.erlang.org/mailman/listinfo/erlang-bugs
> 

-- 
Björn Gustavsson, Erlang/OTP, Ericsson AB



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