JavaScript Tutorial
  • 🍼Introduction
  • 🥛Hello Gamers
  • 🍯Variables
    • Action Game Example
  • 🌰Strings
    • RPG Example
  • 🍪Character Acces
    • Simulation Example
  • 🍩Plus (+) operator
    • Strategy Game Example
  • 🥜Functions
    • Adventure Game Example
  • 🍿Template strings
    • Strategy Game Example
  • 🍫Numbers
    • Sports Game Example
  • 🍬Converting Numbers to Strings
    • Fighting Game Example
  • 🍭Operations
    • FPS Game Example
  • 🍮Conditions
    • Platformer Game Example
  • 🎂Arrays
    • Puzzle Game Example
  • 🍰Objects
    • Racing Game Example
  • 🧁Arrow Functions
    • Rhythm Game Example
  • 🔌Shameless Plug
  • 🥧Implicit Return
    • Platform Game Example
  • 🍦String Methods
    • GRID Game Example
  • 🍨Object Literals
    • Board Game Example
  • 🍧DynamicProperty
    • Political Game Example
  • 🍡Reading Dynamic Property
    • Hide & Seek Game
  • 🥮Objects Continued
    • Medieval Game Example
  • 🥠Object Shorthands
    • Trivia Game example
  • 🔌Shameless Plug (again)
  • 🍥Destructuring & Concatenation
    • Dig a hole game example
  • 🍏Optional Chaining
    • Action Game Example
  • 🍐Nullish coalescing operator
    • Adventure Game Example
  • 🍊Refactoring If Conditions
    • Arcade Game Example
  • 🍋Implicit Conversion & Falcy Values
    • Strategy Game Example
  • 🍌Arrays of objects
    • Sports Game Example
  • 🍉Transforming Array of Objects
    • Fighters Game Example
  • 🍇Some important array methods
    • FPS Example
  • 🫐Reducing arrays of objects
    • Third Person Shooter Example
  • 🍓Try....catch
    • Platformer Example
  • 🍈Immutability
    • Puzzle game example
  • 🍒Creating new arrays or objects
    • Racing Game Example
  • 🔌Shameless Plug (again)
  • 🍑Immutable object operations
    • Basics
    • Rhythm Game Example
  • 🥭Classes
    • Basics
    • Platformer Game Example
  • 🍍Instance Method
    • Basics
    • Role-playing game example
  • 🥥Object Oriented Programming
    • Basics
    • Stealth Game Example
  • 🥝Getters & Setters
    • Basics
    • Survival Game Example
  • 🍅Static Methods & Chaining
    • Basics
    • Tactical Role Playing Game
  • 🍆Class Inheritance
    • Tower Defense Game Example
  • 🥑Use of Super
    • Vehicular Combat Game example
  • 🫒Public Class Field
    • MMORPG Example
  • 🥦Private class fields
    • Battle Royale Games Example
  • 🥬Aysnc/Await
    • Collectible Card Game example
    • Video Board game example
  • 🫑SetTimeout
    • Dice game example
  • 🥒Execution Order
    • Digital Collectible Card Game example
  • 🌶️The callback pattern
    • Life Simulation Game example
  • 🌽Promises
    • Music Game Example
  • 🥕Writing a function that returns a promise
    • Party game example
  • 🧄Introduction to JSON
    • Tile based game example
  • 🧅JSON.parse(string) / JSON.stringify(object)
    • Rhythm action game example
  • 🍠JSON Example for a game
    • Fetching JSON game data
  • 🥐Handling fetch errors
    • Fetch and HTTP Requests
  • 🥯ES Modules
    • Tower Defence Game Example
  • 🍞Default Export
    • Strategy Adventure Game Example
  • 🥖Fetch Wrapper
    • Strategy Role-playing game example
  • 🔌Final Shameless Plug
  • 🫓Lexical Scope and Arrow Functions
    • Vehicular Combat Game Example
  • 🥨Passing Functions
    • Vehicular simulation game example
  • 🥚Dynamic Imports
    • Video card game example
  • 🍠What is a closure
    • Video casino game example
  • 🎆Congratulations
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Objects

An object is a collection of key-value pairs. The keys are strings (or symbols), and the values can be any type of data (strings, numbers, functions, other objects, etc.). Objects are used to store and organize data, and can be used to represent real-world objects and their properties.

There are several ways to create an object in JavaScript:

Object Literal notation:

let person = {
  name: "John",
  age: 30,
  job: "Developer"
};

Using the Object constructor:

let person = new Object();
person.name = "John";
person.age = 30;
person.job = "Developer";

Using Object.create() method:

let personProto = {
  calculateAge: function() {
    console.log(2020 - this.yearOfBirth);
  }
};

let john = Object.create(personProto);
john.name = "John";
john.yearOfBirth = 1990;
john.job = "teacher";

You can access the properties of an object using dot notation (object.property) or bracket notation (object["property"]). For example:

console.log(person.name); // Output: "John"
console.log(person["age"]); // Output: 30

You can also add or modify properties of an object:

person.age = 35;
person.address = "New York";

Objects can also have methods, which are functions that are properties of the object. For example:

let car = {
  brand: "Toyota",
  model: "Camry",
  start: function() {
    console.log("The car is starting.");
  }
};

car.start(); // Output: "The car is starting."

Objects in JavaScript are reference types, which means that when you create an object, you're creating a reference to the memory location where the object is stored.

As objects are used to store and organize data, they are used in many places in JavaScript such as in web development with DOM, in react and vue as state and props, in nodeJS as options and callback, and many more.

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Last updated 2 years ago

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