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transform_values! 

        # Hash.transform_values!

(from ruby core)
---
    hash.transform_values! {|value| ... } -> self
    hash.transform_values! -> new_enumerator

---

Returns `self`, whose keys are unchanged, and whose values are
determined by the given block.
    h = {foo: 0, bar: 1, baz: 2}
    h.transform_values! {|value| value * 100} # => {:foo=>0, :bar=>100, :baz=>200}

Returns a new Enumerator if no block given:
    h = {foo: 0, bar: 1, baz: 2}
    e = h.transform_values! # => #<Enumerator: {:foo=>0, :bar=>100, :baz=>200}:transform_values!>
    h1 = e.each {|value| value * 100}
    h1 # => {:foo=>0, :bar=>100, :baz=>200}

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