Permutations: Difference between revisions

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 =={{header|Scala}}==
-There is a built-in function that works on any sequential collection. It could be used as follows given a List of symbols:
+There is a built-in function in the Scala collections library, that is part of the language's standard library.  The permutation function is available on any sequential collection.  It could be used as follows given a list of numbers:
-<lang scala>List('a, 'b, 'c).permutations foreach println</lang>
+<lang scala>List(1, 2, 3).permutations.foreach(println)</lang>
 {{out}}
-<pre>List('a, 'b, 'c)
-List('a, 'c, 'b)
+  List(1, 2, 3)
-List('b, 'a, 'c)
+  List(1, 3, 2)
-List('b, 'c, 'a)
+  List(2, 1, 3)
-List('c, 'a, 'b)
+  List(2, 3, 1)
-List('c, 'b, 'a)</pre>
+  List(3, 1, 2)
+  List(3, 2, 1)
 The following function returns all the unique permutation of a list: