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assoc 

        # Array.assoc

(from ruby core)
---
    array.assoc(obj) -> found_array or nil

---

Returns the first element in `self` that is an Array whose first element
`==` `obj`:
    a = [{foo: 0}, [2, 4], [4, 5, 6], [4, 5]]
    a.assoc(4) # => [4, 5, 6]

Returns `nil` if no such element is found.

Related: #rassoc.

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