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    <div class="moz-cite-prefix">Rick Pettit schreef op 29-1-2015 om
      20:16:<br>
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    <blockquote
      cite="mid:55690AB8-242D-4061-BC51-97846B0E76DB@vailsys.com"
      type="cite">
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      Comments inline below.
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      <div class="">-Rick</div>
      <div class=""><br class="">
        <div>
          <blockquote type="cite" class="">
            <div class="">On Jan 29, 2015, at 1:14 PM, Roelof Wobben
              <<a moz-do-not-send="true"
                href="mailto:r.wobben@home.nl" class="">r.wobben@home.nl</a>>
              wrote:</div>
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                <div class="moz-cite-prefix"><a moz-do-not-send="true"
                    class="moz-txt-link-abbreviated"
                    href="mailto:e@bestmx.net">e@bestmx.net</a> schreef
                  op 29-1-2015 om 20:06:<br class="">
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                <blockquote cite="mid:54CA84BD.6090908@bestmx.net"
                  type="cite" class="">
                  <blockquote type="cite" class="">So i have to make a
                    tuple of the data and add it in a list. <br
                      class="">
                    <br class="">
                    I thought I could do something like this : <br
                      class="">
                    <br class="">
                    write(Key, Data, Db) -> <br class="">
                       [ {key, data} | Db ] <br class="">
                    <br class="">
                    but then I see some error messages. <br class="">
                  </blockquote>
                  <br class="">
                  what messages? <br class="">
                  <br class="">
                  as far as i can _theorize_ <br class="">
                  the most probably your Db is not a list, and it should
                  be. <br class="">
                  _______________________________________________ <br
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                    href="mailto:erlang-questions@erlang.org">erlang-questions@erlang.org</a>
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                  <br class="">
                  <br class="">
                </blockquote>
                <br class="">
                Here is my code so far : <br class="">
                <br class="">
                -module(db).<br class="">
                <br class="">
                -export([new/0, destroy/1]).<br class="">
                <br class="">
                new() -><br class="">
                  [].<br class="">
                <br class="">
                destroy(Db) -><br class="">
                  {ok}.<br class="">
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          </blockquote>
          <div><br class="">
          </div>
          <div>Why are you returning a tuple here instead of simply ‘ok’
            ?</div>
          <br>
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    </blockquote>
    <br>
    Because of this output : <br>
    <br>
    <div data-row="1" class="terminal-row">10> c(db).                                                                                                                                                                             </div>
    <div data-row="2" class="terminal-row">db.erl:8: Warning: variable 'Db' is unused                                                                                                                                             </div>
    <div data-row="3" class="terminal-row">{ok,db}                                                                                                                                                                                </div>
    <div data-row="4" class="terminal-row">11> Db1 = db:new().                                                                                                                                                                    </div>
    <div data-row="5" class="terminal-row">[]                                                                                                                                                                                     </div>
    <div data-row="6" class="terminal-row">12> Db2 = db:destroy(Db1).                                                                                                                                                             </div>
    ** exception error: no match of right hand side value ok          <br>
    <br>
    When I do this : <br>
    <br>
    -module(db).<br>
    <br>
    -export([new/0, destroy/1, write/3]).<br>
    <br>
    new() -><br>
      [].<br>
    <br>
    destroy(Db) -><br>
      ok.<br>
    <br>
    write(Key, Element, Db) -><br>
       [ {Key, Element} | Db ]. <br>
    <br>
    Roelof<br>
    <br>
    <br>
    <br>
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