KOTLIN ARTICLE

History of Kotlin

Kotlin was developed by JetBrains in 2010. They initially released it under the name Project Kotlin in July 2011. They needed a language that was concise, elegant, expressive, and also interoperable with Java, as most of their products were developed in Java, including the Intellij Idea.

Kotlin Introduction

What is Kotlin?

• Kotlin is an open-source statically typed programming language that targets the JVM, Android, JavaScript and Native. It’s developed by JetBrains
• Kotlin is a cross-platform, statically typed, general-purpose programming language with type inference.

kotlin Syntax

Program entry point

• An entry point of a Kotlin application is the main function.

        
          fun main() {
          println ("Hello world!")
         }
        
      

Print to the standard output

• print prints its argument to the standard output.

        
          print ("Hello ")
          print ("world!")
        
      

Variables

• Read-only local variables are defined using the keyword val. They can be assigned a value only once.

        
          val a: Int = 1  // immediate assignment
          val b = 2   // `Int` type is inferred
          val c: Int  // Type required when no initializer is provided
          c = 3       // deferred assignment
        
      

• Variables that can be reassigned use the var keyword.

        
          var x = 5 // `Int` type is inferred
          x += 1
        
      

• You can declare variables at the top level.

        
          val PI = 3.14
          var x = 0

          fun incrementX() {
          x += 1
         }