Created
March 12, 2013 15:31
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A straightforward way to calculate permutations.
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| function permutations(arr) { | |
| var result = []; | |
| function remove(arr, index) { | |
| return arr.filter(function(_, i) { | |
| return index !== i; | |
| }); | |
| } | |
| function rec(arr, acc) { | |
| result.push(acc); | |
| arr.forEach(function(item, index) { | |
| rec(remove(arr, index), acc.concat(item)); | |
| }); | |
| } | |
| rec(arr, []); | |
| return result; | |
| } |
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