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12696339
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2012-10-02T18:46:43.720
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2012-10-02T18:46:43.720
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This code has a few problems: It seems that you are not realizing that <code>List[T]</code> is an immutable type, meaning you cannot change its value once created. So if you have a <code>List[T]</code> and you call the <code>::</code> method to prepend a value, the function returns a new list and leaves your existing one unchanged. Scala has mutable collections such as <code>ListBuffer</code> which may behave more like you expect. So when you <code>return l</code>, you're actually returning the original list. Also, you have the order wrong in using <code>::</code>. It should go <code>i :: l</code>, since <code>::</code> is a right-binding function (because it ends with a <code>:</code>). Lastly, in your union method you are doing <code>(other contains i)</code>. Maybe it's just the Scala syntax that's confusing you, but this is the same as doing <code>(other.contains(i))</code> and clearly <code>contains</code> is not a defined method of <code>parentSet</code>. It is a method on the <code>List[T]</code> type, but you're not calling <code>contains</code> on a list. You tagged this as homework so I'm not going to fix your code, but I think you should <ol> <li>Look at some examples of correct Scala code involving lists, try <a href="http://anders.janmyr.com/2009/10/lists-in-scala.html" rel="nofollow">here</a> for starters</li> <li>Play around in the Scala REPL and try creating and working with some lists, so you get a feel for how immutable collections work.</li> </ol>
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