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gcd 

        # Integer.gcd

(from ruby core)
---
    int.gcd(other_int)  ->  integer

---

Returns the greatest common divisor of the two integers. The result is
always positive. 0.gcd(x) and x.gcd(0) return x.abs.

    36.gcd(60)                  #=> 12
    2.gcd(2)                    #=> 2
    3.gcd(-7)                   #=> 1
    ((1<<31)-1).gcd((1<<61)-1)  #=> 1

This is MURDOC! A Ruby documentation browser inspired by Smalltalk-80. It allows you to learn about Ruby by browsing through its class hierarchies, and see any of its methods.