JavaScript Objects

Step 1 Beginner

• Objects are variables that can store both values and functions
• Objects are one of the most important concepts in JavaScript
• If you understand objects, you understand JavaScript

Step 2 Beginner

• JavaScript objects are collections of properties
• Properties can be changed, added and deleted

Step 3 Beginner

• Methods are actions that can be performed on objects
• Methods are functions stored as property values

Step 4 Beginner

• In JavaScript, the this keyword refers to an object
• It is used to access the object that is calling a method

Step 5 Beginner

• Displaying properties by name
• Displaying properties in a loop
• Using Object.values()
• Using JSON.stringify()

Step 6 Beginner

• Sometimes we need to create many objects of the same type.
• To create an object type we use an object constructor function.

Step 1 Advanced

• Using an Object Literal
• Using the new Keyword
• Using an Object Constructor
• Using Object.assign()
• Using Object.create()
• Using Object.fromEntries()

Step 2 Advanced

When used in an object method, this refers to the object.

Step 3 Advanced

• Object.entries(object)
• Object.keys(object)
• Object.values(object)
• Object.groupBy(object, callback)

Step 4 Advanced

Getters and setters allow you to define Object Accessors (Computed Properties).

Step 5 Advanced

• Accessing property descriptors
• Adding or changing properties

Step 6 Advanced

• Prevents changes to an object
• Prevents adding properties
• Prevents deleting properties

Step 7 Advanced

• JavaScript objects inherit properties and methods from a prototype

Step 8 Advanced

• All Object Methods and Properties
• Revised July 2025

Continue with the next chapter to learn more about objects: