Problem 4. Try to add a new key to the const object. Were you able to do it?

const obj = {
    "fname" : "anubhav",
    "lname" : "tiwari",
    "age" : 22
};
console.log(obj);   // {fname : 'anubhav', lname : 'tiwari, age: 22}

obj = 47;   // cannot
console.log(obj);

obj["course"] = "MCA";
obj["fname"] = "happy";
console.log(obj);   // {fname : 'happy', lname : 'tiwari, age: 22, course: 'MCA'}