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| rvirding |
 Posted: Thu Dec 03, 2009 2:48 pm |
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User
Joined: 30 Aug 2006
Posts: 452
Location: Stockholm, Sweden
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2009/12/3 Garrett Smith <g@rre.tt>
> On Wed, Dec 2, 2009 at 7:23 PM, Ngoc Dao <ngocdaothanh@gmail.com> wrote:
> >> string:str(List, [Element]).
> >
> > What a surprise! Thank you.
>
> A good example of "most astonishment" 
>
Unfortunately they have added som type checking in string otherwise you
could do string:chr(List,Element). 
Robert
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| Guest |
| Posted: Thu Dec 03, 2009 3:49 pm |
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2009/12/2, Tim Fletcher <twoggle@gmail.com>:
>> Hmm, I fail to come up with a good usage scenario for wanting this. What
>> are
>> you needing the position of an item in a list for?
>
> FWIW, here's something i wrote recently:
>
> base32_decode(Char) ->
> list_index(Char, base32_alphabet()).
>
> base32_alphabet() ->
> "0123456789bcdefghjkmnpqrstuvwxyz".
I usually see code like this implemented like this:
base32_decode2(Char) when Char>=$0, Char=<$9 ->
Char-47;
base32_decode2(Char) when Char>=$b, Char=<$h ->
Char-87;
base32_decode2(Char) when Char>=$j, Char=<$k ->
Char-88;
base32_decode2(Char) when Char>=$m, Char=<$n ->
Char-89;
base32_decode2(Char) when Char>=$p, Char=<$z ->
Char-90.
It (ab)uses the fact that we're latin-1 (effectively ASCII) charset.
The other kind of code I usually see for this kind of task contains
one function clause for each possible inputs. I don't know, but I
think both approaches are faster than traversing the list with
string:str/2. Probably binaries could be used instead of lists to
speed up indexing.
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erlang-questions (at) erlang.org
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| Guest |
| Posted: Thu Dec 03, 2009 9:51 pm |
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> I usually see code like this implemented like this:
>
> base32_decode2(Char) when Char>=$0, Char=<$9 ->
> |
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| wuji |
| Posted: Thu Sep 13, 2012 8:10 am |
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Joined: 10 Aug 2012
Posts: 654
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