javascript_sets1.js

// create a new set
let mySet = new Set();

// add some values to the set
mySet.add(1);
mySet.add("hello");
mySet.add({x: 10, y: 20});

// check if a value is in the set
console.log(mySet.has(1)); // true
console.log(mySet.has("hello")); // true
console.log(mySet.has({x: 10, y: 20})); // false (object equality is not checked)

// get the number of values in the set
console.log(mySet.size); // 3

// remove a value from the set
mySet.delete("hello");