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POInitializing a 2D (multi-dimensional) array in Scala
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2012-12-13T15:01:29.713
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2012-12-13T15:38:27.213
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Body
It's easy to initialize a 2D array (or, in fact, any multidimensional array) in Java by putting something like that: <pre><code>int[][] x = new int[][] { { 3, 5, 7, }, { 0, 4, 9, }, { 1, 8, 6, }, }; </code></pre> It's easy to read, it resembles a 2D matrix, etc, etc. But how do I do that in Scala? The best I could come up with looks, well, much less concise: <pre><code>val x = Array( Array(3, 5, 7), Array(0, 4, 9), Array(1, 8, 6) ) </code></pre> The problems I see here: <ul> <li>It repeats "Array" over and over again (like there could be anything else besides <code>Array</code>)</li> <li>It requires to omit trailing <code>,</code> in every Array invocation</li> <li>If I screw up and insert something besides <code>Array()</code> in the middle of array, it will go okay with compiler, but type of <code>x</code> would silently become <code>Array[Any]</code> instead of <code>Array[Array[Int]]</code>: <pre><code>val x = Array( Array(3, 5, 7), Array(0, 4), 9, // <= OK with compiler, silently ruins x Array(1, 8, 6) ) </code></pre> There is a guard against it, to specify the type directly, but it looks even more overkill than in Java: <pre><code>val x: Array[Array[Int]] = Array( Array(3, 5, 7), Array(0, 4), 9, // <= this one would trigger a compiler error Array(1, 8, 6) ) </code></pre> This last example needs <code>Array</code> even 3 times more than I have to say <code>int[][]</code> in Java.</li> </ul> Is there any clear way around this?
Tags
<scala><multidimensional-array><initialization>
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Initializing a 2D (multi-dimensional) array in Scala
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