Create a Set Class

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In this exercise we are going to create a class named Set to emulate an abstract data structure called "set". A set is like an array, but it cannot contain duplicate values. The typical use for a set is to simply check for the presence of an item. We can see how the ES6 Set object works in the example below:

const set1 = new Set([1, 2, 3, 5, 5, 2, 0]);
console.log(set1);
// output: {1, 2, 3, 5, 0}
console.log(set1.has(1));
// output: true
console.log(set1.has(6));
// output: false

First, we will create an add method that adds a value to our set collection as long as the value does not already exist in the set. Then we will create a remove method that removes a value from the set collection if it already exists. And finally, we will create a size method that returns the number of elements inside the set collection.