[erlang-questions] Bad Argument, (Bug or something I'm missing).

Jesse Gumm <>
Mon Oct 1 10:46:51 CEST 2012


Hi,

You just need to convert List to a binary first with list_to_binary.

The <<"something">> syntax is just a friendly way to make binary literals.
But it does not perform automatic casting of lists.

Further, the extra << >> you're wrapping around "-" is unnecessary.

Example:

> L = "123456",
> B = list_to_binary(L),
> <<B/binary,"-">>.

Will yield:

<<"123456-">>

Hope that helps.

Take it easy,

-Jesse

--
Jesse Gumm
Owner, Sigma Star Systems
414.940.4866 || sigma-star.com || @jessegumm
On Oct 1, 2012 3:11 AM, "Chris Cook" <> wrote:

> Morning list,
>
> I have,
>
> Erlang R15B01 (erts-5.9.1) [source] [async-threads:0] [hipe]
> [kernel-poll:false]
>
> Eshell V5.9.1  (abort with ^G)
> 1> List = "89234789234jhk2hk234892789fauky324978".
> "89234789234jhk2hk234892789fauky324978"
> 2> <<List, <<"-">>/binary>>.
> ** exception error: bad argument
>
> But when I write it as this,
>
> 3> <<"89234789234jhk2hk234892789fauky324978", <<"-">>/binary>>.
> <<"89234789234jhk2hk234892789fauky324978-">>
>
> I get the result I expected to get from the above 1 & 2. Could someone
> please explain what is going wrong and why, because I'm very confused
> with it.
>
> Regards
>
> Chris Cook.
> _______________________________________________
> erlang-questions mailing list
> 
> http://erlang.org/mailman/listinfo/erlang-questions
>
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