const user = {
name: "Emil",
age: 25,
role: "Teacher",
classes: ["Javascript 1", "Javascript 2"],
hobbies: {
favourite: "computers",
sports: "running to class",
},
};
console.log(user);
// Add new property
user.lastName = "Bay";
console.log(user);
delete user.lastName;
console.log(user);
console.log(user.hobbies.favourite);
console.log({ favourite: "computers", sports: "running to class" }.favourite);
function graduatedClass(student, className) {
if (student.classes.includes(className)) return "Error";
student.classes.push(className);
}
console.log(user);
graduatedClass(user, "HTML");
console.log(user);
graduatedClass(user, "HTML");
const newUser = {
name: "",
age: "",
};
var students = [];
function addStudent(student) {
if (student.name == null && typeof student.name === "string") return "Error";
if (student.age == null) return "Error";
students.push(student);
}
addStudent({ name: "Rahim" });
console.log(students);
// ways to access properties
user.name;
user["name"];
const prop = "name";
user[prop];
user["name"] = "Maria";
user[0] = "Hello world";
console.log(user);// one way to have multiple data about a student is with an array
// for each piece of data
const studentNames = ["Fowad", "Emil", "Zoey"];
const studentAges = [32, 25, 28];
console.log(studentNames);
console.log(studentAges);
// Another, more ergonomic way is with objects
const students = [
{ name: "Fowad", age: 32 },
{ name: "Emil", age: 25, teacher: true },
{ name: "Zoey", age: 28 },
];
console.log(students);
// We can access properties with `.`
console.log(students[0].name);
for (let i = 0; i < students.length; i++) {
const currentStudent = students[i];
console.log(typeof currentStudent);
console.log(currentStudent.name);
}
students.push({ name: "Ahmad", age: 27 });
// One object that we have seen before
const Math = {
random: function () {
return 42;
},
round: function (x) {},
};function a() {
// add to call stack
b();
return "a";
// remove from call stack
}
function b() {
//throw 'hello';
return "b";
}
a();function bookPlaneTickets() {
// draw
console.log("Plane tickets booked");
requestVacationDays();
// draw
}
function bookHotel() {
console.log("Hotel booked");
// draw
planItinerary();
// draw
}
function requestVacationDays() {
// draw
console.log("Vacation days requested");
// draw
}
function planItinerary() {
console.log("Itinerary done");
// draw
}
function planTrip() {
bookPlaneTickets();
// draw
bookHotel();
// draw
console.log("Trip planned");
}
// draw
planTrip();
// draw