mapsExample.js

var person = new Map();

person.set("Formal Name", "Kanye West");
person.set("Alias", "Yeezy");
person.set("Goal", "GOAT"); // don't stop reading here!

console.log(person.has("Formal Name")) // true
console.log(person.size); // 3

person.delete("Goal");
console.log(person.has("Goal")); // false
console.log(person.size); // 2

var result = person.get("Alias");
console.log(result); // "Yeezy"

console.log(person.keys()); // "Formal Name", "Alias"
console.log(person.values()); // "Kanye West", "Yeezy"
console.log(person.entries()); // ["Formal Name", "Kanye West"], ["Alias", "Yeezy"]

person.clear();
console.log(person.size); // 0