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shuffle 

        # Array.shuffle

(from ruby core)
---
    array.shuffle(random: Random) -> new_ary

---

Returns a new array with elements of `self` shuffled.
    a = [1, 2, 3] #=> [1, 2, 3]
    a.shuffle     #=> [2, 3, 1]
    a             #=> [1, 2, 3]

The optional `random` argument will be used as the random number
generator:
    a.shuffle(random: Random.new(1))  #=> [1, 3, 2]

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