[erlang-questions] io:format problem within a process, but not in the shell

Eric Holbrook <>
Tue Dec 16 16:54:38 CET 2008


If you are right, then why does the list comprehension line work in the
shell, but not within the context of the process? I don't understand how
the context determines the validity or behavior of that particular syntax.

thanks,
Eric

 wrote:
> Maybe I'm not correct but I think, this because you are creating a
> list as a second statement instead of printing the list in the first
> io:format statement.
>
>
> On 12/16/08, Eric Holbrook <> wrote:
>   
>> Why doesn't *all* of my io:format code work w/in the context of my
>> process?
>>
>>
>> <code>
>>
>> setMgr( Set ) ->
>>     receive
>>         {repr} ->
>>             io:format("Set elements: ~n"),
>>             [io:format("    ~p~n", [Elem]) || Elem <- sets:to_list(Set)],
>>             setMgr(Set);
>>         {other various blocks to add/modify my internal set 'Set'} ->
>>             ...
>>     end.
>>
>> </code>
>>
>> When i send the {repr} msg to a 'setMgr' process, i get the 'Set
>> elements' output, but somehow the list comprehension part doesn't show
>> up in STDOUT.
>>
>> However, if i create a set named Set in the shell, and execute the
>> list comprehension line, it works fine.
>>
>> tia,
>> Eric
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>> 
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>>
>>     
>
>   




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