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delete_if 

        # Array.delete_if

(from ruby core)
---
    array.delete_if {|element| ... } -> self
    array.delete_if -> Enumerator

---

Removes each element in `self` for which the block returns a truthy
value; returns `self`:
    a = [:foo, 'bar', 2, 'bat']
    a.delete_if {|element| element.to_s.start_with?('b') } # => [:foo, 2]

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

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