[erlang-questions] concentate solution well ??

[Bob Ippolito]

On Sun, Feb 1, 2015 at 3:08 AM, Roelof Wobben <r.wobben@REDACTED> wrote:

>  Bob Ippolito schreef op 1-2-2015 om 11:24:
>
> The goal is to solve the problem as stated such that it would work for
> *any* example, not just that one. It's very easy to come up with an example
> that does not work with your implementation.
>
>  Perhaps you should read the source for the lists module, and take the
> time to try and understand it.
> https://github.com/erlang/otp/blob/maint/lib/stdlib/src/lists.erl
>
> On Sun, Feb 1, 2015 at 2:14 AM, Roelof Wobben <r.wobben@REDACTED> wrote:
>
>> Hello,
>>
>> I have this exercise of the Erlang programming book.
>>
>> Write a function that, given a list of lists, will concatenate them.
>> Example:
>> concatenate([[1,2,3], [], [4, five]]) ⇒ [1,2,3,4,five].
>> Hint: you will have to use a helpfunction and concatenate the lists in
>> several steps.
>>
>> But I do not need to use a helper function because it can be solved like
>> this :
>>
>> concatenate( [List1 , List2 , List3] ) ->
>>     List1 ++ List2 ++ List3.
>>
>> Or is this not the solution that is meant on this exercise ?
>> Do I need to solve it by using pattern matching ?
>>
>> Roelof
>>
>> _______________________________________________
>> erlang-questions mailing list
>> erlang-questions@REDACTED
>> http://erlang.org/mailman/listinfo/erlang-questions
>>
>
>
> Thanks, I will do this,
>
> But there is one problem.
>
> The source is full of -spec and in programming erlang that is explained in
> chapter 18 where Im trying exercises of chapter 3.
>

Well, just ignore the -spec annotations. They are essentially structured
documentation, they don't change the behavior of the program.
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