Returns the GCD and the LCM (see #gcd and #lcm) of the two arguments (self and other). This is more efficient than calculating them separately.
6.gcdlcm 9 # -> [3, 18]
# File lib/rational.rb, line 473 def gcdlcm(other) gcd = self.gcd(other) if self.zero? or other.zero? [gcd, 0] else [gcd, (self.div(gcd) * other).abs] end end