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sample 

        # Array.sample

(from ruby core)
---
    array.sample(random: Random) -> object
    array.sample(n, random: Random) -> new_ary

---

Returns random elements from `self`.

When no arguments are given, returns a random element from `self`:
    a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
    a.sample # => 3
    a.sample # => 8

If `self` is empty, returns `nil`.

When argument `n` is given, returns a new Array containing `n` random
elements from `self`:
    a.sample(3) # => [8, 9, 2]
    a.sample(6) # => [9, 6, 10, 3, 1, 4]

Returns no more than `a.size` elements (because no new duplicates are
introduced):
    a.sample(a.size * 2) # => [6, 4, 1, 8, 5, 9, 10, 2, 3, 7]

But `self` may contain duplicates:
    a = [1, 1, 1, 2, 2, 3]
    a.sample(a.size * 2) # => [1, 1, 3, 2, 1, 2]

The argument `n` must be a non-negative numeric value. The order of the
result array is unrelated to the order of `self`. Returns a new empty
Array if `self` is empty.

The optional `random` argument will be used as the random number
generator:
    a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
    a.sample(random: Random.new(1))     #=> 6
    a.sample(4, random: Random.new(1))  #=> [6, 10, 9, 2]

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