1. Kotlin is more concise
First, Kotlin is way more concise than Java in many cases, solving the same problems with fewer lines of code. This improves code maintainability and readability, meaning engineers can write, read, and change code more effectively and efficiently
2. Kotlin code is safer
Kotlin code is inherently safer than Java code because it prevents common programming mistakes by design, resulting in fewer system failures and application crashes. When using Java, certain error causes are more likely to occur again. Kotlin nudges developers to think about potential problems with their code explicitly, hence helping them write more robust code.
3. Kotlin has better support for functional programming
Functional programming is a development paradigm that allows developers to solve many tasks more easily and consistently. It was also introduced in Java 8, but Kotlin has better support for functional programming. In short, functional concepts can be used more concisely and explicitly with proper function types. Also, performance can be improved via inlining which is not currently possible in Java.
4. Kotlin speeds up every-day development tasks
In addition, Kotlin offers a myriad of handy features that facilitate every-day development tasks–something Java does not offer. These include default parameter values, object declarations, extension functions, and many more. All these help speed up development time while keeping the code base more maintainable.
5. Kotlin helps reduce errors and bugs in the code
The Kotlin compiler aims to fail-fast whenever possible. This greatly facilitates searching for bugs and can even prevent them in the first place.The Kotlin compiler performs many checks, avoiding runtime errors and reducing the cost and effort of error fixes.
6. The code base shrinks and increases in quality
Technical debt can be mitigated to some degree by migrating to Kotlin. “Technical debt” is the deadweight developers carry due to shortcuts made in programming, often to reach a deadline. It slows down future development and reduces productivity. It can be minimized with Kotlin because the code base shrinks while increasing in quality (maintainability, readability etc.) at the same time. Implemented correctly, this means fewer lines of code that are easier to maintain. Reports of such migrations often speak of reducing lines of code by 20-30%.
7. The Kotlin community supports developers
Kotlin has brought together a thriving and supportive community that is highly responsive and open so that developers can connect to share expertise and get their questions answered, for instance in the active Kotlin slack channel.
With the increasing adoption of Kotlin, there are also more resources available for developers every day, including online courses, books, and tutorials. There are now thousands of StackOverflow questions on Kotlin which provides a go-to resource for developers.