Question

This is probably a silly question however, is there a simple way of doing antijoins of collections in Groovy?

I know there are [equivilent ways of doing unions and intersections].

My thought on how to do this is:

List a,b; 
union(a,b) - intersection(a,b) 

However, I’m not sure if there is a difference operator for collections in groovy.

Answer 1

It turns out that can you can do a subtraction operation on 2 lists, and receive a list back of the disjoint collection. Just use the subtraction operator between two lists.

 listone - listtwo