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If this is a new project and there's nothing holding you back from using 1. IMHO, Kotlin is not about big killer features — although extension methods and properties could certainly be categorized as such. Retrieved 19 January 2018. Kotlin JetBrains and open source contributors First appeared 2011 1.

The Kotlin counterpart is handled through the use function, whose signature is:. The name comes from , near St.

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This article may rely excessively on sources , potentially preventing the article from being and. Please help by replacing them with more appropriate to. February 2018 Kotlin is a that runs on the and also can be compiled to source code or use the compiler infrastructure. Its primary development is from a team of programmers based in , Russia. While the syntax is not compatible with Java, the JVM implementation of the Kotlin standard library is designed to interoperate with code and relies on Java code from the existing , such as the. Kotlin uses aggressive to determine the types of values and expressions for which type has been left unstated. This reduces language verbosity relative to Java, which demands often entirely redundant type specifications prior to. Kotlin code can run on JVM up to latest Java 11. Kotlin JetBrains and open source contributors First appeared 2011 1. The Android Kotlin compiler lets the user choose between targeting 6, or Java 8-compatible bytecode. In July 2011, JetBrains unveiled Project Kotlin, a new language for the JVM, which had been under development for a year. JetBrains lead Dmitry Jemerov said that most languages did not have the features they were looking for, with the exception of. However, he cited the slow compile time of Scala as an obvious deficiency. One of the stated goals of Kotlin is to compile as quickly as Java. In February 2012, JetBrains open sourced the project under the. The name comes from , near St. JetBrains hopes that the new language will drive sales. This is considered to be the first officially stable release and JetBrains has committed to long-term backwards compatibility starting with this version. At 2017, announced first-class support for Kotlin on. Sharing code between JVM and Javascript platforms feature was newly added to this release. Kotlin declarations and have the come after the variable name and with a separator , similar to. Variables in Kotlin can be , declared with the val keyword, or mutable, declared with the var keyword. Class members are public by default, and classes themselves are sealed by default, meaning that creating a derived class is disabled unless the base class is declared with the open keyword. In addition to the and called member functions in Kotlin of , Kotlin also supports with the use of. Functional programming style Kotlin relaxes Java's restriction of allowing methods and variables to exist only within a class body. Static objects and functions can be defined at the top level of the package without needing a redundant class level. For compatibility with Java, Kotlin provides a JvmName annotation which specifies a class name used when the package is viewed from a Java project. In other words, an extension method is a helper method that has access to all the public interface of a class which it can use to create a new method interface to a target class and this method will appear exactly like a method of the class, appearing as part of code completion inspection of class methods. For example: 1 package MyStringExtensions 2 3 fun String. A deconstructor's job is to decompose a class object into a tuple of elemental objects. For example a 2D coordinate class might be deconstructed into a tuple of integer x and integer y. For example, the collection object contains a deconstructor method that splits each collection item into an index and an element variable: 1 class User 2 val id : Int , 3 val name : String , 4 val address : String 5 { 6 7 fun saveUser user : User { 8 fun validate user : User , value : String , fieldName : String { 9 if value. This is in contrast to most object oriented languages such as Java where classes are open by default. Example of a base class that is open to deriving a new subclass from it. Abstract classes are open by default. The ability to selectively choose which of the constructor properties to initialize is based on keyword selection of the property during object creation. Non-initialized constructor properties are simply set to a default value. Kotlin makes a distinction between nullable and non-nullable data types. Operations on nullable objects need special care from developers: null-check must be performed before using the value. If the object is null, the method will not be called and the expression evaluates to null. IntelliJ IDEA 15 is the first version to bundle the Kotlin plugin in the IntelliJ Installer, and provide Kotlin support out of the box. The platform was stuck on Java 7 for a while with some contemporary language features made accessible through the use of Retrolambda or the Jack toolchain and Kotlin introduces many improvements for programmers such as null-pointer safety, extension functions and infix notation. Accompanied by full Java compatibility and good IDE support Android Studio it is intended to improve code readability, give an easier way to extend Android SDK classes and speed up development. Kotlin was announced as an official Android development language at 2017. It became the third language fully supported for Android, in addition to Java and C++. According to the Kotlin website, is using Kotlin in the backend. DripStat has done a writeup of their experience with Kotlin. According to Jetbrains blog, Kotlin is used by Amazon Web Services, Pinterest, Coursera, Netflix, Uber, Square, Trello, , and others. Corda, a distributed ledger developed by a consortium of well-known banks such as Goldman Sachs, Wells Fargo, J. Morgan, Deutsche Bank, UBS, HSBC, BNP Paribas, Société Générale , has over 90% Kotlin in its codebase. According to Google, Kotlin has already been adopted by several major developers — , Flipboard, , Square, and others — for their Android production apps. Retrieved February 2, 2014. Retrieved April 20, 2018. Kotlin lets you choose between generating Java 6 and Java 8 compatible bytecode. More optimal byte code may be generated for higher versions of the platform. Retrieved February 2, 2014. Retrieved February 2, 2014. Retrieved February 2, 2014. Retrieved February 8, 2014. Retrieved 19 January 2018. Retrieved February 8, 2014. Retrieved 19 January 2018.

A deconstructor's job is to decompose a class object into a tuple of elemental objects. One of the stated goals of Kotlin is to prime as quickly as Java. Android Architecture Components Extensions This is the Android Architecture Components extension library available for kotlin. Retrieved April 20, 2018. If you have an idea for new types of artifact metadata, click on the Feedback tab on the right-hand side of the page to social it with us. Configuration There isn't any. Kotlin JetBrains and open source contributors First appeared 2011 1. I used kotlin infix notation for the following code. For new development, see ShadowFacts version.