Adding and deleting items from a Set

We will start out with the simplest possible tasks involving a Set. In this recipe, we'll take a look at how to add and delete items from a Set using the respective instance methods.

Getting ready

This recipe assumes that you already have a workspace that allows you to create and run ES modules in your browser. If you don't, refer to the first two chapters.

How to do it...

1. Open your command-line application, and navigate to your workspace.
2. Create a new folder named 12-01-add-remove-from-set.
3. Copy or create an index.html that loads and runs a main function from main.js.
4. Create a main.js file that defines a main function. In that function, create a new Set instance, then add and remove a few items from it:

// main.js
export function main() {
    const rocketSet = new Set();
    rocketSet.add('US: Saturn V');
    rocketSet.add('US: Saturn V');
    rocketSet.add('US: Falcon Heavy');
    console.log(rocketSet);
    rocketSet.delete('US: Falcon Heavy');
    console...