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count 

        # Array.count

(from ruby core)
---
    array.count -> an_integer
    array.count(obj) -> an_integer
    array.count {|element| ... } -> an_integer

---

Returns a count of specified elements.

With no argument and no block, returns the count of all elements:
    [0, 1, 2].count # => 3
    [].count # => 0

With argument `obj`, returns the count of elements `==` to `obj`:
    [0, 1, 2, 0.0].count(0) # => 2
    [0, 1, 2].count(3) # => 0

With no argument and a block given, calls the block with each element;
returns the count of elements for which the block returns a truthy
value:
    [0, 1, 2, 3].count {|element| element > 1} # => 2

With argument `obj` and a block given, issues a warning, ignores the
block, and returns the count of elements `==` to `obj`:

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