Given:
a1 = [5, 1, 6, 14, 2, 8]
I would like to determine if it contains all elements of:
a2 = [2, 6, 15]
In this case the result is false.
Are there any built-in Ruby/Rails methods to identify such array inclusion?
One way to implement this is:
a2.index{ |x| !a1.include?(x) }.nil?
Is there a better, more readable, way?