const b = true;
const n = 984642;
const s = "node.js";
const obj = {
id: 911118,
name: "roy",
salary: 14900,
work: true
}
console.log(typeof b);
console.log(typeof n);
console.log(typeof s);
console.log(typeof obj);
console.log(typeof obj.id);
console.log(typeof X);
/*
run:
boolean
number
string
object
number
undefined
*/