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