<div dir="ltr"><div>Roelof,<br><br></div>Do you get any type-errors with your code?<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Feb 26, 2015 at 8:32 PM, Roelof Wobben <span dir="ltr"><<a 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">
  
    
  
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    Oke, <br>
    <br>
    I send it a second time but now in plain text.<br>
    <br>
    So for 3 it will be like this : <br>
    <br>
    Node = Node  (Node Leaf "msg1" Leaf) (Node Leaf "msg2") (Node 
    "msg3" Leaf)  ???<div><div class="h5"><br>
    <br>
    Roelof<br>
     <br>
    <br>
    <br>
    <blockquote type="cite">
      <div> <br>
        <br>
        Konstantine Rybnikov schreef op 26-2-2015 om 15:08:<br>
      </div>
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          <div>
            <div>In my second example you can see a minimal node with a
              message:<br>
              <br>
              node = Node Leaf "msg" Leaf<br>
              <br>
            </div>
            Instead of either left or right Leaf you can put another
            value of type MessageTree, for example:<br>
            <br>
          </div>
          node = Node Leaf "msg1" (Node Leaf "msg2" Leaf)<br>
        </div>
        <div class="gmail_extra"><br>
          <div class="gmail_quote">On Thu, Feb 26, 2015 at 4:01 PM,
            Roelof Wobben <span dir="ltr"><<a 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">
              <div bgcolor="#FFFFFF" text="#000000">
                <div>Oke, <br>
                  <br>
                  So a leaf is a node which has no "branch"<br>
                  <br>
                  I have made a exercise where I have to made the 
                  logMessages. <br>
                  Now I have to turn them into a tree <br>
                  <br>
                  Where does the second entry goes then ?<br>
                  <br>
                  Roelof<br>
                  <br>
                  <br>
                  Konstantine Rybnikov schreef op 26-2-2015 om 14:56:<br>
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                    <blockquote type="cite">
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                                <div>
                                  <div>
                                    <div>Hi Roelof,<br>
                                      <br>
                                    </div>
                                    I think you misunderstood it.<br>
                                    <br>
                                  </div>
                                  <div>There are two things here: types
                                    and values (value-constructors).
                                    They exist in different world, not
                                    touching each other.<br>
                                    <br>
                                  </div>
                                  <div>In Haskell, you define a type as:<br>
                                    <br>
                                  </div>
                                  <div>data <Type_Name> =
                                    <ValueConstructor_Name>
                                    <Type_Name> <Type_Name>
                                    <Type_Name><br>
                                    <br>
                                  </div>
                                  <div>You can create values as:<br>
                                    <br>
                                  </div>
                                  <div>let varName =
                                    <ValueConstructor_Name>
                                    <Value> <Value>
                                    <Value><br>
                                    <br>
                                  </div>
                                  <div>You need to put <Value> of
                                    some type, not type name itself in
                                    place of those <Value>s.<br>
                                    <br>
                                  </div>
                                  <div>So, with datatype you provided,
                                    you have two data-constructors:<br>
                                    <br>
                                  </div>
                                  <div>Leaf<br>
                                    <br>
                                  </div>
                                  <div>and<br>
                                    <br>
                                  </div>
                                  <div>Node <val> <val>
                                    <val><br>
                                    <br>
                                  </div>
                                  <div>You can create a leaf:<br>
                                    <br>
                                  </div>
                                  <div>let leaf = Leav<br>
                                    <br>
                                  </div>
                                  <div>or a node:<br>
                                    <br>
                                  </div>
                                  <div>let node = Node Leaf "msg" Leaf<br>
                                    <br>
                                  </div>
                                  <div>You can see that Node is a
                                    data-constructor that takes 3
                                    values, not type-names as it's
                                    parameters.<br>
                                    <br>
                                  </div>
                                  <div>Hope this helps.<br>
                                  </div>
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                      <div class="gmail_extra"><br>
                        <div class="gmail_quote">On Thu, Feb 26, 2015 at
                          3:21 PM, Roelof Wobben <span dir="ltr"><<a 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>
                            Suppose we have this definition of a tree :<br>
                            <br>
                            data MessageTree = Leaf<br>
                                             | Node MessageTree
                            LogMessage MessageTree<br>
                              deriving (Show, Eq)<br>
                            <br>
                            let Message  = LogMessage "E 1 this is a
                            test error"<br>
                            let Message = LogMessage "e 2 this is the
                            second test error "<br>
                            <br>
                            As I understand it right I can make the
                            first entry like this : first_entry = Node
                            Messagetree  Message Messagetree<br>
                            <br>
                            And the second one like this second_entry =
                            Node Message Messagetree Message2
                            Messagetree ??<br>
                            <br>
                            Roelof<br>
                            <br>
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