[erlang-questions] Idiom for multiple case matches

Ulf Wiger (TN/EAB) <>
Mon Nov 10 19:29:50 CET 2008


So try it with the absolutely wonderful and indispensable
parse transform utility ct_expand.  ;-)

http://forum.trapexit.org/viewtopic.php?p=20260#20260


BR,
Ulf W


David Mercer skrev:
> For completeness, I did run some benchmarking.  I hesitate to put my name to
> my solution, since it was suggested in jest, but I am vindicated because it
> performed as expected:
> 
> 1,000,000 Iterations:
>         Virding: Run-Time/Wall-Clock: 94/94 milliseconds
>         Cronqvist: Run-Time/Wall-Clock: 141/141 milliseconds
>         Mercer: Run-Time/Wall-Clock: 14547/14547 milliseconds
> 
> Cheers,
> 
> David
> 
>> -----Original Message-----
>> From: David Mercer [mailto:]
>> Sent: Monday, November 10, 2008 11:05
>> To: 'mats cronqvist'; 'Michael Radford'
>> Cc: 'Hynek Vychodil'; 'Erlang Questions'
>> Subject: RE: [erlang-questions] Idiom for multiple case matches
>>
>> Since this is, semantically, a set operation, should we not perhaps use
>> sets:is_element/2 instead?  Something like:
>>
>> 	vowels() -> sets:from_list("aeiou").
>> 	is_vowel(C) -> sets:is_element(C, vowels()).
>>
>> Just kidding, of course... (Obvious efficiency issues.) :-)
>>
>> DBM
>>
>> P.S. No, Mats, I did not benchmark this. :-)
> 
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