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How to create a randomized version of an array

my_array = [1, 2, 3, 4, 5, 6]
shuffled = my_array.shuffle # some random ordering, e.g. [3, 2, 1, 6, 4, 5]

Very useful for testing things where ordering shouldn’t matter and you want to explicitly declare that.

Takes a random number generator as an arg.

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