Ruby - Does array A contain all elements of array B [duplicate]

Answer 1

I prefer to do this via: (b - a).blank? # tells that b is contained in a

Answer 2

You can try this

a.sort.uniq == b.sort.uniq

or

(a-b).empty?

And if [1,2,2] != [1,2] in your case you can:

a.group_by{|i| i} == b.group_by{|i| i}