object.js

let name = 'rajat';
let age = 21;
let city = 'delhi';

// let obj = {
//     name: name,
//     age: age,
//     city: city
// }
let obj = {name, age, city};   //in modern javascript(ES6) we can write like this if key and value both are same
// let obj = {name, age, city,key:11};  //we can also add key value pair like this for line 18
console.log(obj);   
// console.log(obj.age); //to access value of key age in obj
// console.log(obj['city']); //another way to access value of key city in obj

for(let key in obj){      //to iterate all key value pair in object
    console.log(key);
    // console.log(obj.key);   //undefined because obj.key means key is key name but here key is variable which contain key name
    console.log(obj[key]);  //to access value of key in object by variable key
}