[erlang-questions] string title bif?

Zoltan Lajos Kis <>
Fri Jun 25 20:40:28 CEST 2010


I think a tiny state-machine with "mapfoldl" is a cleaner (albeit more 
imperative :o)) approach for this.

title(String) ->
     {Title, _} = lists:mapfoldl(fun f/2, 'sep', String),
     Title.

f($_, _) -> {$ , 'sep'};
f(C, 'sep') -> {string:to_upper(C), 'char'};
f(C, _) -> {C, 'char'}.

Regards,
Zoltan.


On 6/25/2010 8:23 PM, Wes James wrote:
> Is there a BIF that does this (I can't find one, if there is):
>
> string:title("this_is_a_title") ->  "This Is A Title".
>
> Or something like this?  If not I'll just create one.
>
> It would need to split the string at the "_" and then uppercase the
> first character of each word.
>
> This test works:
>
> -------------------
>
> -module(title).
>
> -export([start/0]).
>
> start() ->
> 	title(string:tokens("this_is_a_title","_")).
> 	
> title([H|T]) ->
> 	[fc_upper(H)|title(T)];
> title([]) ->  [].
>
> fc_upper([C|R]) ->
> 	[string:to_upper(C)]++R.
>
> ----------------
>
> thx.
>
> -wes
>
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