Learning JavaScript Data Structures and Algorithms - Third Edition

Set union

In this topic, we will cover the mathematical concept of union. The union of sets A and B is denoted by:

And is defined as:

This means that x (the element) exists in A or x exists in B. The following diagram exemplifies the union operation:

Now, let's implement the union method in our Set class with the following code:

union(otherSet) {  const unionSet = new Set(); // {1}  this.values().forEach(value => unionSet.add(value)); // {2}