An introduction to Kotlin by example
summary
Kotlin is a JetBrains language that compiles to JVM and JavaScript (Apache 2) and teams it into existing Maven/Gradle/IntelliJ workflows; development starts in 2011 with 1.0 out in 2016 and a small core team (~20 active committers). Examples show extension functions, data classes and nullable types, operator overloading, tailrec annotation, no checked exceptions, and Java interop (bytecode becomes platform types). Demos include a data‑munging kata, JUnit/Spek tests, and a working Swing Snake game; coroutines are marked experimental in 1.1.
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