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rassoc 

        # Hash.rassoc

(from ruby core)
---
    hash.rassoc(value) -> new_array or nil

---

Returns a new 2-element Array consisting of the key and value of the
first-found entry whose value is `==` to value (see [Entry
Order](#class-Hash-label-Entry+Order)):
    h = {foo: 0, bar: 1, baz: 1}
    h.rassoc(1) # => [:bar, 1]

Returns `nil` if no such value found.

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