Ruby array subtraction without removing items more than once

Question

The canonical Array difference example in Ruby is:

[ 1, 1, 2, 2, 3, 3, 4, 5 ] - [ 1, 2, 4 ]  #=>  [ 3, 3, 5 ]

What\'s the best way to ge

Answer 1

This is all I can think of so far:

[1, 2, 4].each { |x| ary.delete_at ary.index(x) }