Question

I have these arrays:

x = ['a','b','c','d']
y = ['b','c','e']

I’d like to get rid of the commonalities in x and y and ignore the non-commonalities in y.

Ideally, when I do something to the two arrays, I would get ['a','d'].

Is there something that does this in Ruby?

Answer 1

x = [:a, :b, :c, :d]
y = [:b, :c, :e]
x - y                  # [:a, :d]

The - method, “array difference”, returns a new array that is a copy of the original array,
removing any items that also appear in the second one.