Level 1 summary

1. 🚀 Kotlin is one of the most popular programming languages

Did you know that Kotlin is one of the most popular and in-demand programming languages in the world?

Kotlin was created by JetBrains and is officially supported by Google as the primary language for Android development. Today, Kotlin is used by millions of developers around the world — from startups to the largest technology companies 👨‍💻

Kotlin appeared in 2011 as a response to real developer pain points. Its goal is to make programming simpler, safer, and more enjoyable. It is fully compatible with Java, but it lets you write code that is shorter, clearer, and faster.

Companies are actively switching to Kotlin because it:

• reduces the number of bugs
• speeds up development
• makes code more readable
• increases developer productivity

This is especially important in real projects. Developers spend up to 90% of their time reading and understanding code, and Kotlin was created specifically to make code as clear and logical as possible.

Kotlin is a next-generation language designed with modern industry requirements in mind.

2. 🥇 Main areas where Kotlin is used

Kotlin runs on the JVM and can be used almost anywhere Java is used — and beyond.

📱 Mobile apps (Android)

Kotlin is the official language for Android development. Most new Android apps today are written in Kotlin. By mastering it, you will be able to build real applications used by thousands and millions of people.

🌍 Web development and backend

Kotlin is used to build the server side of web applications. It is used to create APIs, web services, and backend systems. Many modern companies choose Kotlin for their server solutions thanks to its safety and convenience.

🏦 Enterprise and business applications

Kotlin is fully compatible with Java and the entire JVM ecosystem. This means it can be used to build banking systems, enterprise services, accounting systems, and analytics systems. Kotlin is gradually becoming a new standard for development in the JVM world.

💻 Desktop applications

Kotlin allows you to build programs for Windows, macOS, and Linux. With it, you can write both small utilities and full-featured user applications.

☁️ Cloud services

Kotlin is actively used to build cloud services and server applications. It is well-suited for developing scalable and reliable systems.

🌐 Multiplatform development

With Kotlin Multiplatform, you can write code that runs on multiple platforms at once: Android, iOS, Web, and Desktop. This is a modern approach that lets you build applications faster and more efficiently.

Kotlin is not just a language, but a modern ecosystem with a large community, lots of libraries, and excellent support.

3. 🎯 Level 1 summary

Congratulations — you have completed your first level on JavaRush! Just one level in, and you have already learned a lot of important and interesting things. Great job! 👍

You learned:

• What variables are;
• How to display messages on the screen;
• Got introduced to the types Int and String;
• Learned how compilation in Kotlin differs from other languages;
• How to write comments in Kotlin and why they are needed.

Excellent! Of course, the next levels will not be as easy, but the difficulty will increase gradually — just like the difficulty of the practical tasks. Just like in the gym: little by little you increase the load, and a beginner presses a 100-kilogram barbell from the chest after six months 💪

Boring lessons stayed in the 20th century. I mean, seriously — writing with chalk on a board. Nothing has changed since the 15th century. They probably still had dinosaurs walking around the streets there 🦕

You are moving on to the next level! 🚀