Question

Let’s say I am trying to remove elements from array a = [1,1,1,2,2,3]. If I perform the following:

b = a - [1,3]

Then I will get:

b = [2,2]

However, I want the result to be

b = [1,1,2,2]

i.e. I only remove one instance of each element in the subtracted vector not all cases. Is there a simple way in Ruby to do this?

Answer 1

You may do:

a= [1,1,1,2,2,3]
delete_list = [1,3]
delete_list.each do |del|
    a.delete_at(a.index(del))
end

result : [1, 1, 2, 2]