The difference method returns a new Set with the elements of the current Set that aren’t in the Set that is passed as an argument.
For example, Set1.difference(Set2) will find the elements of Set1 that are not present in Set2 and create them as a new Set and return them.
Set<E> difference(Set<E> other)
This method takes a Set object as a parameter.
A new Set containing elements of the current Set that are not present in the parameter Set.
The code below demonstrates how to use the difference method:
import 'dart:collection';void main() {//create a new LinkedHashSet which can have int type elementsLinkedHashSet set1 = new LinkedHashSet<int>();// add four elements to the set1set1.add(1);set1.add(2);set1.add(3);set1.add(6);print('The set1 is $set1');//create another LinkedHashSet which can have int type elementsLinkedHashSet set2 = new LinkedHashSet<int>();// add three elements to the setset2.add(1);set2.add(3);set2.add(4);print('The set2 is $set2');//Finding elements of set1 that are not present in set2Set<int> result = set1.difference(set2);print('The differene is $result');}
Line 1: We import the collection library.
Line 4: We create a new LinkedHashSet object named set1.
Lines 7–10: We add four new elements to set1. Now set1 is {1,2,3,6}.
Line 14: We create a new LinkedHashSet object named set2.
Lines 17–19: We add three new elements to set2. Now set2 is {1,3,4}.
Line 24: We use the difference method to get the elements of set1 that are not in set2. In our case, the elements 2 and 6 of set1 are not present in set2 so a new set with elements 2 and 6 is returned.