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reject! 

        # Hash.reject!

(from ruby core)
---
    hash.reject! {|key, value| ... } -> self or nil
    hash.reject! -> new_enumerator

---

Returns `self`, whose remaining entries are those for which the block
returns `false` or `nil`:
    h = {foo: 0, bar: 1, baz: 2}
    h.reject! {|key, value| value < 2 } # => {:baz=>2}

Returns `nil` if no entries are removed.

Returns a new Enumerator if no block given:
    h = {foo: 0, bar: 1, baz: 2}
    e = h.reject! # => #<Enumerator: {:foo=>0, :bar=>1, :baz=>2}:reject!>
    e.each {|key, value| key.start_with?('b') } # => {:foo=>0}

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