YouTipKotlin Tutorial
# Kotlin Tutorial
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Kotlin is a statically typed programming language that runs on the Java Virtual Machine, also known as the Swift of the Android world, designed and developed by JetBrains and open-sourced.
Kotlin can be compiled to Java bytecode or to JavaScript, making it convenient to run on devices without a JVM.
At Google I/O 2017, Google announced Kotlin as an official development language for Android.
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## My First Kotlin Program
Kotlin program files end with .kt, for example: hello.kt, app.kt.
## Minimal Version
package hello// Optional package header fun main(args: Array){// Package-level function that accepts an array of strings as a parameter println("Hello World!")// Semicolons can be omitted}
[Run Example »](#)
## Object-Oriented
class Greeter(val name: String){fun greet(){println("Hello, $name")}}fun main(args: Array){Greeter("World!").greet()// No need for the 'new' keyword to create an object}
[Run Example »](#)
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## Why Choose Kotlin?
* Concise: Drastically reduces the amount of boilerplate code.
* Safe: Avoids entire classes of errors such as null pointer exceptions.
* Interoperable: Leverages existing libraries for JVM, Android, and the browser.
* Tool-friendly: Can be used with any Java IDE or built from the command line.
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## Reference Links
* (http://www.kotlinlang.org/)
* (http://try.kotlinlang.org/)
* (https://www.kotlincn.net/)
* (https://play.kotlinlang.org/)
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