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filter! 

        # Hash.filter!

(from ruby core)
---
    filter!()

---

Hash#filter! is an alias for Hash#select!.

Returns `self`, whose entries are those for which the block returns a
truthy value:
    h = {foo: 0, bar: 1, baz: 2}
    h.select! {|key, value| value < 2 }  => {:foo=>0, :bar=>1}

Returns `nil` if no entries were removed.

Returns a new Enumerator if no block given:
    h = {foo: 0, bar: 1, baz: 2}
    e = h.select!  # => #<Enumerator: {:foo=>0, :bar=>1, :baz=>2}:select!>
    e.each { |key, value| value < 2 } # => {:foo=>0, :bar=>1}


(This method is an alias for Hash#select!.)

Hash#filter! is an alias for Hash#select!.

Returns `self`, whose entries are those for which the block returns a
truthy value:
    h = {foo: 0, bar: 1, baz: 2}
    h.select! {|key, value| value < 2 }  => {:foo=>0, :bar=>1}

Returns `nil` if no entries were removed.

Returns a new Enumerator if no block given:
    h = {foo: 0, bar: 1, baz: 2}
    e = h.select!  # => #<Enumerator: {:foo=>0, :bar=>1, :baz=>2}:select!>
    e.each { |key, value| value < 2 } # => {:foo=>0, :bar=>1}

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