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    <div class="moz-cite-prefix">Bob Ippolito schreef op 1-2-2015 om
      11:24:<br>
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    <blockquote
cite="mid:CACwMPm86AgNr6DQZMmJFoSqZiT-G+7B1w3Ck5dDqjJncoopRew@mail.gmail.com"
      type="cite">
      <div dir="ltr">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.
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        <div>Perhaps you should read the source for the lists module,
          and take the time to try and understand it. <a
            moz-do-not-send="true"
            href="https://github.com/erlang/otp/blob/maint/lib/stdlib/src/lists.erl">https://github.com/erlang/otp/blob/maint/lib/stdlib/src/lists.erl</a></div>
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      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Sun, Feb 1, 2015 at 2:14 AM, Roelof
          Wobben <span dir="ltr"><<a moz-do-not-send="true"
              href="mailto:r.wobben@home.nl" target="_blank">r.wobben@home.nl</a>></span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello,<br>
            <br>
            I have this exercise of the Erlang programming book.<br>
            <br>
            Write a function that, given a list of lists, will
            concatenate them.<br>
            Example:<br>
            concatenate([[1,2,3], [], [4, five]]) ⇒ [1,2,3,4,five].<br>
            Hint: you will have to use a helpfunction and concatenate
            the lists in several steps.<br>
            <br>
            But I do not need to use a helper function because it can be
            solved like this :<br>
            <br>
            concatenate( [List1 , List2 , List3] ) -><br>
                List1 ++ List2 ++ List3.<br>
            <br>
            Or is this not the solution that is meant on this exercise ?<br>
            Do I need to solve it by using pattern matching ?<br>
            <br>
            Roelof<br>
            <br>
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          </blockquote>
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    </blockquote>
    <br>
    Thanks, I will do this,<br>
    <br>
    But there is one problem.<br>
    <br>
    The source is full of -spec and in programming erlang that is
    explained in chapter 18 where Im trying exercises of chapter 3.<br>
    <br>
    Roelof<br>
    <br>
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