%%js
var personalObj = {
firstname: "Eshaan",
lastname: "Kumar",
age: 16,
grade: 11,
school: "Del Norte High School",
city: "San Diego",
classlist: ["AP English Language", "AP Calculus BC", "US History", "AP Physics C", "AP Computer Science Principles"],
sport: "Tennis",
hobbies: ["hanging out with friends", "listening to music", "watching movies"],
interests: ["computer science", "engineering"]
};
var age = 16;
var firstname = "Eshaan";
console.log(personalObj);
console.log("Object: mutating the interests array key to economics and finance");
personalObj.interests = ["economics", "finance"];
console.log(personalObj);
console.log("In 5 years I will be:");
console.log(personalObj.age + 5);
console.log("If Billy is half my age Billy is:");
console.log(personalObj.age/2);
console.log(typeof personalObj)
console.log(typeof age)
console.log(typeof firstname)
<IPython.core.display.Javascript object>
