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<div class="moz-cite-prefix">Oke, <br>
<br>
so for 3 nodes it looks like this : <br>
<br>
node = Node (Node Leaf "msg 1") (Node Leaf "msg2) (Node leaf
"msg3) <br>
<br>
I think I see a recursion pattern appear. <br>
<br>
Roelof<br>
<br>
<br>
Konstantine Rybnikov schreef op 26-2-2015 om 15:08:<br>
</div>
<blockquote
cite="mid:CAAbahfRW8-XtPgGs1Md5-t4EjqKapsDrd0b4TnqdU0tQzU2NNg@mail.gmail.com"
type="cite">
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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 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">
<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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<div>
<div>
<div>
<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>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Thu, Feb 26, 2015 at
3:21 PM, 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>
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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