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reject 

        # Hash.reject

(from ruby core)
---
    hash.reject {|key, value| ... } -> new_hash
    hash.reject -> new_enumerator

---

Returns a new Hash object whose entries are all those from `self` for
which the block returns `false` or `nil`:
    h = {foo: 0, bar: 1, baz: 2}
    h1 = h.reject {|key, value| key.start_with?('b') }
    h1 # => {:foo=>0}

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>
    h1 = e.each {|key, value| key.start_with?('b') }
    h1 # => {:foo=>0}

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