That's a good illustration of how the Kotlin functions and classes are implemented under the hood. If you click on it, you'll see the Java code that corresponds to the initial Kotlin code. This button will decompile the generated bytecode to the analogous Java code. In the bytecode, you can check the return type for functions whether it returns a primitive file, or your oil wrapper type. It opens you the generated bytecode corresponding to the open Kotlin file. You can call show Kotlin bytecode action in IntelliJ idea or Android Studio. However, let's discuss what happens under the hood at the bytecode level. In Kotlin, we don't distinguish primitive types and reference types. In this section, we'll discuss Kotlin types, several Java types they correspond to, and discuss what happens with these types under the hood at the bytecode level. We'll discuss: basic syntax, nullability, functional programming with Kotlin, object-oriented programming with Kotlin, the power of the Kotlin standard library, and Java interoperability. Note that this course won't cover the programming fundamentals. The course is based on your Java experience it shows the similarities between the two languages and focuses on what's going to be different. We'll have a basic overview of the language, as well as a discussion of many corner cases, especially concerning Java interoperability. This course aims to share with you the power and the beauty of Kotlin. Kotlin code might be compiled not only to JVM bytecode but to JavaScript and Native code as well, but this course is focused on Kotlin/JVM. It’s a pragmatic language with a very low learning curve, and can be quickly grasped by Java developers. Kotlin is 100% compatible with all existing Java frameworks, and has good tooling support. It can be used almost everywhere Java is used today: for server-side development, Android apps, and much more. Kotlin is concise, safe, pragmatic, and focused on interoperability with Java code. The Kotlin programming language is a modern language that gives you more power for your everyday tasks.
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