Learning JavaScript Data Structures and Algorithms - Third Edition

Set difference

In this topic, we will cover the mathematical concept of difference. The difference between sets A and B is denoted by A - B, which is defined as:

This means that x (the element) exists in A, but x does not exist in B. The following diagram exemplifies the difference operation between sets A and B:

Now, let's implement the difference method in our Set class using the following code:

difference(otherSet) {  const differenceSet = new Set(); // {1}   this.values().forEach(value => { // {2}     if (!otherSet.has(value)) { // {3}  differenceSet.add(value); ...