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assoc 

        # Hash.assoc

(from ruby core)
---
    hash.assoc(key) -> new_array or nil

---

If the given `key` is found, returns a 2-element Array containing that
key and its value:
    h = {foo: 0, bar: 1, baz: 2}
    h.assoc(:bar) # => [:bar, 1]

Returns `nil` if key `key` is not found.

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