subtract method
Returns a set containing all elements that are contained by this collection and not contained by the specified collection. The returned set preserves the element iteration order of the original collection.
example:
1,2,3,4,5,6
.subtract(4,5,6
)
result: 1,2,3
Implementation
subtract(Iterable<T> other) {
final set = toSet();
set.removeAll(other);
return set;
}