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replace 

        # Hash.replace

(from ruby core)
---
    replace(p1)

---

Replaces the entire contents of `self` with the contents of
`other_hash`; returns `self`:
    h = {foo: 0, bar: 1, baz: 2}
    h.replace({bat: 3, bam: 4}) # => {:bat=>3, :bam=>4}


(This method is an alias for Hash#initialize_copy.)

Replaces the entire contents of `self` with the contents of
`other_hash`; returns `self`:
    h = {foo: 0, bar: 1, baz: 2}
    h.replace({bat: 3, bam: 4}) # => {:bat=>3, :bam=>4}

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