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PO
 

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  1. PO
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    <p>Try tu use more general types in match phrase, like <code>GenTraversable</code> to witch exists implicit conversion.</p> <pre class="lang-scala prettyprint-override"><code>import scala.collection.GenTraversable def rprint[T](a: T, indent: Int = 0): Unit = a match { case x: String =&gt; println(" "*indent + '"' + x + '"') case x: GenTraversable[_] =&gt; println(" "*indent + (x.stringPrefix)) x foreach (rprint(_, indent+2)) case x: Array[_] =&gt; println(" "*indent + (a.getClass.getSimpleName)) x foreach (rprint(_, indent+2)) case x =&gt; println(" "*indent + x) } rprint(Map(1-&gt;"one",2-&gt;"two")) rprint(List("one", "two")) //I don't know why this type is printed weird: $colon$colon rprint(Array(1,2)) //This prints less weird: int[] </code></pre> <p>You can add more cases for specific missing types (like tuples)</p> <p>I can't figure what is the problem with printing some type names (like <code>List</code> and <code>Array</code> - see the example after the function definition). Both <code>a.getClass.getSimpleName</code> and <code>a.ToString</code> returns wired string</p> <p>I've also try to connect type <code>Array</code> and <code>GenTraversable</code> - because there is implicit conversion from <code>Array</code> to <code>WrapperArray &lt;: GenTraversable</code>. <br /> The solution below doesn't satisfy as it prints "WrappedArray" instead "Array", when we call the function with <code>Array</code> instance</p> <pre><code>case x: Array[_] =&gt; rprint(x:GenTraversable[_]) </code></pre> <p>Edit:<br /> I've changed name extractor for GenTraversable to <code>a.stringPrefix</code></p>
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    1. POArrays in recursive print method
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    1. USRobert Zaremba
    1. USRobert Zaremba
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      1. VTUpMod
    1. COThis doesn't compile (for me, in REPL, v2.9.0-1) `error: type mismatch; found : a.type (with underlying type T) required: ?{val getClass: ?}`. I'm looking for display names as in the `toString`, or the `stringPrefix` methods, rather than class names, which can be different (e.g. `List`'s concrete type is `::`).
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      1. USLuigi Plinge
    2. COI don't know. For me everything goes fine.
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      1. USRobert Zaremba
    3. COI got it working after upgrading to 2.9.1. I would replace `(a.getClass.getSimpleName)` with simply `"Array"`. This doesn't do quite what's specified since it outputs collection / array elements each on their own line, rather than a string representing the collection (see OP for test case). This is what that makes the problem non-trivial.
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      1. USLuigi Plinge
 

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