Constructors in TypeScript 🚀 | How Constructors Work with Real Examples (2026)

When working with Classes in TypeScript, you often need to initialize an object's properties when that object is created. This is where a Constructor becomes extremely useful. In this beginner-friendly TypeScript tutorial, you'll learn everything you need to know about Constructors in TypeScript, including what a constructor is, why we use it, when it is automatically called, how to define one inside a Class, and how to initialize object properties using constructor parameters. A constructor is a special method inside a Class that is automatically executed when we create a new object using the new keyword. It allows us to set the initial state of an object instead of manually assigning every property after the object has been created. This topic is extremely important because Constructors are used throughout Object-Oriented Programming and prepare you for more advanced TypeScript concepts such as Access Modifiers, Readonly Properties, Inheritance, Getters & Setters, and Abstract Classes. This lesson is part of our Complete TypeScript Course 2026, where we learn TypeScript from beginner to advanced using practical coding examples, real-world scenarios, interview-focused concepts, and industry best practices. 📚 What You'll Learn In This Video ✔ What is a Constructor? ✔ Why do we use Constructors? ✔ Constructor vs Regular Method ✔ How Constructors work ✔ When a Constructor is called ✔ Creating a Constructor ✔ Constructor Parameters ✔ Initializing Properties ✔ Creating Objects with Constructors ✔ The new Keyword ✔ Multiple Objects with Different Values ✔ Typed Constructor Parameters ✔ Default Constructor ✔ Custom Constructor ✔ Real-world examples ✔ Common beginner mistakes ✔ Best practices ✔ Interview questions 🔥 What Is a Constructor? A Constructor is a special part of a Class that is automatically called when an object is created. ⚡ Constructor vs Method A Constructor and a regular method are not the same. Constructor: ➡ Automatically called when an object is created. ➡ Used mainly for initialization. ➡ Has the special name constructor. Method: ➡ Usually called manually. ➡ Performs some behavior or action. ➡ Can have any valid method name. Understanding this difference is essential when learning Classes and OOP. 💻 Real-World Usage Constructors are commonly used in: ✔ User Management Systems ✔ E-commerce Applications ✔ Banking Applications ✔ Employee Management Systems ✔ Order Management Systems ✔ Product Catalogs ✔ Authentication Systems ✔ Backend Services ✔ API Services ✔ Database Models ✔ Game Development ✔ Enterprise Applications For example, an Order Class might use a Constructor to initialize: Order ID Customer ID Total Amount Order Status Similarly, a Product Class could initialize: Product ID Product Name Price Category By the end of this lesson, you'll understand how Constructors work, how they initialize objects, how constructor parameters are typed, and why Constructors are an essential part of Object-Oriented Programming in TypeScript. If you're enjoying this Complete TypeScript Course 2026, don't forget to Like 👍, Share 📤, Comment 💬, and Subscribe 🔔. Your support helps us continue creating free programming tutorials, software engineering content, interview preparation material, and practical development courses. #TypeScript #Constructors #TypeScriptClasses #TypeScriptConstructor #OOP #ObjectOrientedProgramming #LearnTypeScript #Programming #Coding #WebDevelopment #JavaScript #FrontendDevelopment #BackendDevelopment #ReactJS #NodeJS #NextJS #SoftwareDevelopment #CodingTutorial #SoftwareEngineering #TypeScript2026 #TechPakistan ---------------------------------------------------------------------------------------------------------------------------- Welcome to MO academy – Learn Code the Easy Way We’re Mariyam & Omaima, two friends passionate about coding and technology. On this channel, you’ll find beginner-friendly tutorials and simple explanations of tech concepts to help you learn and grow step by step. 🔥 What you’ll get here: Easy-to-follow coding tutorials Explanations of tech concepts Hands-on projects & practical examples Student-friendly learning content 💻 Connect with us: source code & notes for reactjs playlist:https://github.com/Mariyamsalman/reac... source code & notes for javascript playlist:https://github.com/Mariyamsalman/java... Instagram 👉   / mo.academyy   Facebook 👉   / moacademyy   GitHub of Mariyam Salman 👉 https://github.com/Mariyamsalman GitHub of Omaima Sarfaraz 👉https://github.com/OmaimaSarfaraz ✨ Don’t forget to Like 👍, Share 🔗, and Subscribe 🔔 to stay updated with our latest tutorials! #MO academy #CodingForBeginners #TechTutorials