Removing elements from array Ruby

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]