Determine if one array contains all elements of another array

Question

I need to tell if an array contains all of the elements of another array with duplicates.

[1,2,3].contains_all? [1,2]   #=> true
[1,2,3].contains_all         


        

Answer 1

It seems you need a multiset. Check out this gem, I think it does what you need.

You can use is and do something like (if the intersection is equal to the second multiset then the first one includes all of its elements):

@ms1 & @ms2 == @ms2