Spread operator

let data = {
  username: "GauravJ",
  email: "email@gmail.com",
  favLang: "JavaScript",
};

let data_updated = { ...data, favLang: "Java" };

console.log(data_updated);

Destructuring

let data = {
  username: "GauravJ",
  email: "email@gmail.com",
  favLang: "JavaScript",
};

let { username, email, favLang } = data; //Destructuring

Async js

Promises and callback

Async-await

Map filter and reduce

Map

Filter

Reduce

Triple equality