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common_element.rb

This Ruby code snippet demonstrates set intersection and finding common elements between arrays. Specifically, (a & b).sort.first calculates the intersection of arrays a and b, sorts the resulting set, and returns the first element. a.find { |x| b.include?(x) } finds the first element present in both arrays a and b.

Ruby code snippet

a = ["z3qx", "l9ma", "b77r", "x1p0"]
#=> ["z3qx", "l9ma", "b77r", "x1p0"]
b = ["x1p0", "l9ma", "wxyz"]
#=> ["x1p0", "l9ma", "wxyz"]

(a & b).sort.first
#=> "l9ma"
a.find { |x| b.include?(x) }
#=> "l9ma"

Executed with Ruby 3.4.5.