JavaScript Lab Learning: A Student Workbook on JavaScript Objects

Welcome to our JavaScript Lab Learning Student Workbook on the topic of JavaScript Objects!
In this workbook, we will explore the concept of objects, class and type theory, and how they apply in JavaScript. You will also find three highly detailed, explicit, and well-documented examples of JavaScript object and type code. Let's dive in!

Introduction to JavaScript Objects

JavaScript objects are collections of key-value pairs, where each key (property) maps to a value. They can be used to store and manage data, as well as to represent real-world entities in your code. You can create objects using the object literal syntax, like this:

Class and Type Theory

In many programming languages, classes are used as blueprints for creating objects. They define the properties and methods that instances of the class (objects) will have. JavaScript, however, is a prototype-based language and does not use traditional class-based inheritance. Instead, it uses objects to define and inherit properties and methods.
JavaScript uses dynamic typing, which means that a variable's type can change during runtime. The basic data types in JavaScript are: number, string, boolean, object, and undefined. As previously mentioned, objects are used to represent more complex structures and can contain other data types, including other objects.

Example 1: Basic JavaScript Object


In this example, we create a book object with properties such as title, author, publishYear, and isAvailable. We then access the properties using the dot notation.

Example 2: Objects with Methods


In this example, we create a person object with properties firstName, lastName, and age, as well as a method called fullName. The fullName method uses the this keyword to access the object's properties and returns a string containing the person's full name.
Example 3: Prototypes and Inheritance

In this example, we create two "classes" using constructor functions: Animal and Dog.
We use Animal.prototype to define a method called describe that all Animal instances will have. Then, we create the Dog
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