Kotlin is a programming language created in 2011 by JetBrains to allow for multiplatform applications. It was developed to increase sales of IntelliJ IDEA and was released under the Apache 2 license in 2012. Kotlin is similar to Scala but compiles as quickly as Java. It aims to be concise, safe, interoperable with Java, and tool-friendly for development.

1. KOTLIN

2. Concept
 Programming language for multiplatarform
applications.

3. History
 Created in 2011.
 Developed by JetBrains, in Saint Petersbrug,
Russia.
 Bet to increase Intellij IDEA sales.
 In February 2012 got License Apache 2.
 Version 1.0 released on February, 16, 2015.
 In 2017, promoted by Google Android.
 Similar features with Scala.
 Compile as quickly as Java.

4. Website
 http://kotlinlang.org/
 Latest version: 1.1.3-2

5. Advantages
 Concise
 Safe
 Interoperable
 Tool-friendly

6. Concise

7. Safe

8. Interoperable

9. Tool-friendly

10. Ways to write your code
 Intellij IDEA
 Android Studio
 Eclipse
 Compiler

11. Build Tools





12. Let’s code
 Hello World example.

13. Variables

14. Functions

15. Data Manipulation
 String templates
 Condicional expressions

16. Loop

17. Iterating Collections

18. Declaring Collections

19. Try it online
 https://try.kotlinlang.org/

20. Kotlin x Spring Boot

21. Kotlin x JavaScript

22. Kotlin x JavaScript cont.

23. Kotlin x Java Benchmark
 https://medium.com/keepsafe-engineering/kotlin-vs-java-compilation-
speed-e6c174b39b5d

24. 1 - Compilation Speed
For clean build with no Gradle daemon, Java compiles 17% faster than
Kotlin.

25. 2 - Compilation Speed
For clean build with Gradle daemon warmed up, Java compiles 13%
faster than Kotlin.

26. 3 - Compilation Speed
Incremental compilation with no files changed.

27. 4 - Compilation Speed
Incremental compilation with a modified UI source file.

28. 5 - Compilation Speed
Incremental compilation with a modified source file, where the file is
imported into many other files.

29. Kotlin Usage

30. Time for...

31. This is the end...