Create and Add to Sets in ES6

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Now that you have worked through ES5, you are going to perform something similar in ES6. This will be considerably easier. ES6 contains a built-in data structure Set so many of the operations you wrote by hand are now included for you. Let's take a look:

To create a new empty set:

var set = new Set();

You can create a set with a value:

var set = new Set(1);

You can create a set with an array:

var set = new Set([1, 2, 3]);

Once you have created a set, you can add the values you wish using the add method:

var set = new Set([1, 2, 3]);
set.add([4, 5, 6]);

As a reminder, a set is a data structure that cannot contain duplicate values:

var set = new Set([1, 2, 3, 1, 2, 3]);
// set contains [1, 2, 3] only