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divmod 

        # Integer.divmod

(from ruby core)
---
    divmod(other) -> array

---

Returns a 2-element array `[q, r]`, where

    q = (self/other).floor    # Quotient
    r = self % other          # Remainder

Examples:

    11.divmod(4)              # => [2, 3]
    11.divmod(-4)             # => [-3, -1]
    -11.divmod(4)             # => [-3, 1]
    -11.divmod(-4)            # => [2, -3]

    12.divmod(4)              # => [3, 0]
    12.divmod(-4)             # => [-3, 0]
    -12.divmod(4)             # => [-3, 0]
    -12.divmod(-4)            # => [3, 0]

    13.divmod(4.0)            # => [3, 1.0]
    13.divmod(Rational(4, 1)) # => [3, (1/1)]

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