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POArrays in recursive print method
primarykey
Id
8152368
data
AcceptedAnswerId
8164285
AnswerCount
4
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2011-11-16T13:23:43.627
FavoriteCount
1
LastActivityDate
2011-11-17T09:20:32.913
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PostTypeId
1
Score
2
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621
LastEditorDisplayName
text
Body
I'm trying to make a <code>println</code> replacement that outputs nested collections in a more readable format. This is best illustrated with an example: I'd like <code>List(Set(Vector(1.0,1.1), Vector(0d)), Set(Vector("a", "b", "c"), Vector("x", "y")))</code> to be printed as <pre><code>List Set Vector(1.0, 1.1) Vector(0.0) Set Vector(a, b, c) Vector(x, y) </code></pre> This would be a lot easier without type erasure, but I've come up with <pre><code>def rprint(a: Any, indent: Int = 0): Unit = a match { case x: Traversable[_] => if (x.isEmpty) rprint(x.toString, indent) else x.head match { case y: Traversable[_] => { rprint(x.toString.takeWhile(_ != '('), indent) x foreach {i => rprint(i, indent + 2)} } case y => rprint(x.toString, indent) } case x => println(" " * indent + x) } </code></pre> I'm struggling with getting this to work nicely with Arrays, without substantial code duplication. I'd like them to work the same as for other collections. Specifically: <ul> <li>Arrays are not <code>Traversable</code></li> <li>could convert Arrays using <code>genericArrayOps</code> to ArrayOps which is <code>TraversableOnce</code>, but <code>TraversableOnce</code> doesn't have a <code>head</code> method, so I can't see how to get an element to check its type</li> <li><code>toString</code> doesn't work quite like other collections (use <code>.deep</code>)</li> </ul> What's the best way to incorporate Arrays into this method, or is there a different approach that would work better?
Tags
<arrays><scala>
Title
Arrays in recursive print method
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1. PO
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1. USLuigi Plinge
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