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cycle 

        # Array.cycle

(from ruby core)
---
    array.cycle {|element| ... } -> nil
    array.cycle(count) {|element| ... } -> nil
    array.cycle -> new_enumerator
    array.cycle(count) -> new_enumerator

---

When called with positive Integer argument `count` and a block, calls
the block with each element, then does so again, until it has done so
`count` times; returns `nil`:
    output = []
    [0, 1].cycle(2) {|element| output.push(element) } # => nil
    output # => [0, 1, 0, 1]

If `count` is zero or negative, does not call the block:
    [0, 1].cycle(0) {|element| fail 'Cannot happen' } # => nil
    [0, 1].cycle(-1) {|element| fail 'Cannot happen' } # => nil

When a block is given, and argument is omitted or `nil`, cycles forever:
    # Prints 0 and 1 forever.
    [0, 1].cycle {|element| puts element }
    [0, 1].cycle(nil) {|element| puts element }

When no block is given, returns a new Enumerator:

    [0, 1].cycle(2) # => #<Enumerator: [0, 1]:cycle(2)>
    [0, 1].cycle # => # => #<Enumerator: [0, 1]:cycle>
    [0, 1].cycle.first(5) # => [0, 1, 0, 1, 0]

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