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reject! 

        # Array.reject!

(from ruby core)
---
    array.reject! {|element| ... } -> self or nil
    array.reject! -> new_enumerator

---

Removes each element for which the block returns a truthy value.

Returns `self` if any elements removed:
    a = [:foo, 'bar', 2, 'bat']
    a.reject! {|element| element.to_s.start_with?('b') } # => [:foo, 2]

Returns `nil` if no elements removed.

Returns a new Enumerator if no block given:
    a = [:foo, 'bar', 2]
    a.reject! # => #<Enumerator: [:foo, "bar", 2]:reject!>

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