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Mastering Generics in Kotlin: A Beginner to Advanced Guide with Examples 🚀

Jayant Kumar🇮🇳
5 min readMar 7, 2025

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Kotlin Generics is a powerful feature that allows developers to write flexible, reusable, and type-safe code. If you’ve ever seen List<T>, Map<K, V>, or MutableSet<T>, you’ve already encountered generics! But how do they work? And how can you use them effectively in your Kotlin projects?

In this guide, we’ll cover:

✅ What Generics Are
✅ Why We Need Generics
✅ Declaring Generic Classes and Functions
✅ Variance: In, Out, and Star Projections
✅ Reified Types in Inline Functions

By the end of this article, you’ll have a deep understanding of generics in Kotlin with hands-on examples. Let’s dive in! 🚀

🚀 What Are Generics in Kotlin?

Generics allow you to define a class, function, or interface with type parameters. Instead of working with a specific data type, generics enable working with…

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Jayant Kumar🇮🇳
Jayant Kumar🇮🇳

Written by Jayant Kumar🇮🇳

Hello My name is Jayant Kumar, I am a software Engineer , specialist in Mobile Development (Android , IOS , Flutter , React Native) from India 🇮🇳

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