Here is an idea I came up with in #perl (freenode) thanks to a few folks there. Assume an even number of elements:
- 1. Shuffle the indices of the array (copy not actual values)
- 2. Swap adjacent pairs (actually change values)
For instance: 0 - 9 might become 5, 3, 1, 2, 4, 7, 9, 8, 0, 6
Swap index 5 with 3, 1 with 2, 4 with 7, and 9 with 8
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