As I discussed in my article “What is Kotlin? The Java alternative explained,” Kotlin is a general purpose, open source, statically typed “pragmatic” programming language that combines object-oriented and functional programming features. You can use Kotlin to build applications for the Java Virtual Machine (JVM), Android, browsers, and native apps on MacOS, Linux, Windows, iOS, WebAssembly, and Android. Kotlin was created by JetBrains and released to open source under the Apache 2 license.
Why learn Kotlin? The short answer is that Kotlin is a better language for the JVM than Java. Kotlin is less verbose, supports all the features of functional programming, eliminates the danger of null pointer references, streamlines the handling of null values, and maintains 100 percent interoperability with Java and Android. All of that will make you a more productive programmer than you would be writing Java, even if you start by using Kotlin to build new features into an existing Java application.
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