Set Data Structure in JavaScript

let myVariable = new set();

//    Create the new Set
let courses = new Set();

//    Values can be passed in an array at creation
let courses = new Set(["Angular", "Node", "Java"]);

//    .add(value) will add vlaues
courses.add("Angular");
courses.add("Node");
courses.add("Java");

//    .add(value) is chainable
let courses = new Set().add("Angular").add("Node").add("Java");

//    Loop with a for...of
for (let theEntry of courses) {
    console.log(theEntry);
}

//    RESULTS: Angular
//             Node                    
//             Java                

//    .size to see how large it is
console.log(courses.size); // RESULT: 3

//    .has() can be used to check if an item exists in the Set
console.log(courses.has('React')); // RESULT: false

console.log(courses.has('Angular')); // RESULT: true

//    .clear() can be used to delete all items in the Set
console.log(courses); // RESULT: Set(3) {"Angular", "Node", "Java"}

courses.clear();

console.log(courses); // RESULT: Set(0) {}