Readonly & Static Properties in TypeScript 🚀 | Explained with Examples (2026)

Learn Readonly and Static Properties in TypeScript with simple, practical examples! 🚀 In this lesson from our Complete TypeScript Course 2026, we continue learning Object-Oriented Programming (OOP) in TypeScript and explore two important Class property modifiers: readonly and static. When working with Classes, sometimes we want a property to be assigned only once and never changed afterward. In other situations, we want a property or method to belong to the Class itself rather than individual objects. TypeScript provides readonly and static for these different purposes. In this tutorial, we'll first understand the readonly modifier and see how it prevents a property from being reassigned after initialization. We'll then learn about static properties, which are shared at the Class level rather than being created separately for every object. This lesson is part of our Complete TypeScript Course 2026, designed for students, beginners, freelancers, and developers who want to learn TypeScript step by step with practical examples and real-world concepts. 📚 What You'll Learn ✔ What is readonly in TypeScript? ✔ Why use readonly? ✔ How readonly properties work ✔ When a readonly property can be assigned ✔ What happens when you try to change a readonly property ✔ What is static in TypeScript? ✔ Why use static? ✔ Static properties vs instance properties ✔ How to access static properties ✔ Static methods ✔ ClassName.property syntax ✔ Real-world examples ✔ Readonly vs Static ✔ Common mistakes ✔ Best practices 🔒 Readonly Properties The readonly modifier is used when you want a property to be assigned but not reassigned afterward. ⚡ Static Properties A static property belongs to the Class itself, not to each individual object. 🌐 Real-World Applications Readonly and Static properties can be useful in: ✔ User Management Systems ✔ E-commerce Applications ✔ Banking Applications ✔ Authentication Systems ✔ API Services ✔ Configuration Systems ✔ Database Applications ✔ Order Management ✔ Employee Management ✔ Backend Services ✔ Enterprise Applications For example, a Product Class might have a readonly id, while a static property could track how many Product objects have been created. By the end of this lesson, you'll understand the difference between readonly and static properties, know when to use each one, and understand how they work inside TypeScript Classes. If you're enjoying our Complete TypeScript Course 2026, don't forget to Like 👍, Comment 💬, Share 📤, and Subscribe 🔔 for more programming tutorials. #TypeScript #Readonly #Static #TypeScriptClasses #OOP #LearnTypeScript #Programming #Coding #JavaScript #WebDevelopment #ReactJS #NodeJS #NextJS #SoftwareDevelopment #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