[erlang-questions] string title bif?

Zoltan Lajos Kis <>
Fri Jun 25 21:07:48 CEST 2010


That's because the code does what you requested: it uppercases letters 
following an _underscore_.
Nevertheless you can add a new clause for spaces as well:

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

Zoltan.

On 6/25/2010 8:53 PM, Wes James wrote:
> title("this is a test") returns "This is a test".  It only uppercases
> the first word.  This could work to replace my fc_toupper (first char
> to upper), though.
>
> thx,
>
> -wes
>
> On Fri, Jun 25, 2010 at 12:40 PM, Zoltan Lajos Kis<>  wrote:
>    
>> 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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>>
>>      
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