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copied!<pre><code>scala> "1234".combinations(2).toList res9: List[String] = List(12, 13, 14, 23, 24, 34) </code></pre> <p>With a range:</p> <pre><code>scala> (1 to 9).combinations(4).toList res12: List[scala.collection.immutable.IndexedSeq[Int]] = List(Vector(1, 2, 3, 4), Vector(1, 2, 3, 5), Vector(1, 2, 3, 6), Vector(1, 2, 3, 7), Vector(1, 2, 3, 8), Vector(1, 2, 3, 9), Vector(1, 2, 4, 5), Vector(1, 2, 4, 6), Vector(1, 2, 4, 7), Vector(1, 2, 4, 8), Vector(1, 2, 4, 9), Vector(1, 2, 5, 6), Vector(1, 2, 5, 7), Vector(1, 2, 5, 8), Vector(1, 2, 5, 9), Vector(1, 2, 6, 7), Vector(1, 2, 6, 8), Vector(1, 2, 6, 9), Vector(1, 2, 7, 8), Vector(1, 2, 7, 9), Vector(1, 2, 8, 9), Vector(1, 3, 4, 5), Vector(1, 3, 4, 6), Vector(1, 3, 4, 7), Vector(1, 3, 4, 8), Vector(1, 3, 4, 9), Vector(1, 3, 5, 6), Vector(1, 3, 5, 7), Vector(1, 3, 5, 8), Vector(1, 3, 5, 9), Vector(1, 3, 6, 7), Vector(1, 3, 6, 8), Vector(1, 3, 6, 9), Vector(1, 3, 7, 8), Vector(1, 3, 7, 9), Vector(1, 3, 8, 9), Vector(1, 4, 5... </code></pre> <p>As a List of Ints:</p> <pre><code> "123456789".combinations(4).map(_.toInt).toList res37: List[Int] = List(1234, 1235, 1236, 1237, 1238, 1239, 1245, 1246, 1247, 1248, 1249, 1256, 1257, 1258, 1259, 1267, 1268, 1269, 1278, 1279, 1289, 1345, 1346, 1347, 1348, 1349, 1356, 1357, 1358, 1359, 1367, 1368, 1369, 1378, 1379, 1389, 1456, 1457, 1458, 1459, 1467, 1468, 1469, 1478, 1479, 1489, 1567, 1568, 1569, 1578, 1579, 1589, 1678, 1679, 1689, 1789, 2345, 2346, 2347, 2348, 2349, 2356, 2357, 2358, 2359, 2367, 2368, 2369, 2378, 2379, 2389, 2456, 2457, 2458, 2459, 2467, 2468, 2469, 2478, 2479, 2489, 2567, 2568, 2569, 2578, 2579, 2589, 2678, 2679, 2689, 2789, 3456, 3457, 3458, 3459, 3467, 3468, 3469, 3478, 3479, 3489, 3567, 3568, 3569, 3578, 3579, 3589, 3678, 3679, 3689, 3789, 4567, 4568, 4569, 4578, 4579, 4589, 4678, 4679, 4689, 4789, 5678, 5679, 5689, 5789, 6789) </code></pre> <p>And if you are in fact interested in the various permutations (the question has changed a bit since I wrote the above answers)</p> <pre><code>scala> "1234".combinations(2).toList.flatMap(_.permutations).map(_.toInt) res51: List[Int] = List(12, 21, 13, 31, 14, 41, 23, 32, 24, 42, 34, 43) </code></pre>

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