Scala version

For some errors and warnings, the compiler now suggests an edit that could fix the issue. Tooling such as IDEs can then offer the edits, scala version, or the compiler itself will make the change if run again with -quickfix.

Please consult the Scala 2. A class may now extend AnyVal to make it behave like a struct type restrictions apply. The implicit modifier now also applies to class definitions to reduce the boilerplate of implicit wrappers. Get on top of the advanced Scala features used in your codebase by explicitly importing them. The original Scala actors are now deprecated. See the actors migration project for more information. The API is subject to possibly major changes in the 2.

Scala version

Designed to be concise, [9] many of Scala's design decisions are intended to address criticisms of Java. Scala can also be compiled to JavaScript to run in a browser, or directly to a native executable. On the JVM Scala provides language interoperability with Java so that libraries written in either language may be referenced directly in Scala or Java code. Since Scala 3, there is also an option to use the off-side rule indenting to structure blocks , and its use is advised. Martin Odersky has said that this turned out to be the most productive change introduced in Scala 3. Unlike Java, Scala has many features of functional programming languages like Scheme , Standard ML , and Haskell , including currying , immutability , lazy evaluation , and pattern matching. It also has an advanced type system supporting algebraic data types , covariance and contravariance , higher-order types but not higher-rank types , anonymous types , operator overloading , optional parameters , named parameters , raw strings , and an experimental exception-only version of algebraic effects that can be seen as a more powerful version of Java's checked exceptions. The name Scala is a portmanteau of scalable and language , signifying that it is designed to grow with the demands of its users. It followed on from work on Funnel, a programming language combining ideas from functional programming and Petri nets. After an internal release in late , Scala was released publicly in early on the Java platform , [15] [7] [14] [16] A second version v2. Scala runs on the Java platform Java virtual machine and is compatible with existing Java programs. The reference Scala software distribution, including compiler and libraries, is released under the Apache license. Version v1. Scala Native is a Scala compiler that targets the LLVM compiler infrastructure to create executable code that uses a lightweight managed runtime, which uses the Boehm garbage collector.

It is now explicitly ruled out that case classes can be abstract. The partial application of sum in the last line of scala version code above will not be converted to a function type.

To install Scala, it is recommended to use cs setup , the Scala installer powered by Coursier. It installs everything necessary to use the latest Scala release from a command line:. Download and execute the Scala installer for Windows based on Coursier, and follow the on-screen instructions. JavaScript is disabled, click the tab relevant for your OS. Follow the documentation from Coursier on how to install and run cs setup. If that does not work, you may need to log out and log back in or reboot in order for the changes to take effect. If you are just beginning your journey with Scala, we recommend that you read our getting started guide, which expands upon these details, teaching you how to build your first Scala project:.

The exciting new version of Scala 3 brings many improvements and new features. Here we provide you with a quick overview of the most important changes. If you want to dig deeper, there are a few references at your disposal:. Scala 3 is a complete overhaul of the Scala language. At its core, many aspects of the type-system have been changed to be more principled. While this also brings exciting new features along like union types , first and foremost, it means that the type-system gets even less in your way and for instance type-inference and overload resolution are much improved. One underlying core concept of Scala was and still is to some degree to provide users with a small set of powerful features that can be combined to great and sometimes even unforeseen expressivity.

Scala version

For the complete 2. As usual for our minor releases, Scala 2. Upgrading from 2. Enable -Xmigration while upgrading to request migration advice from the compiler. A big thank you to everyone who's helped improve Scala by reporting bugs, improving our documentation, spreading kindness in discussions around Scala, and submitting and reviewing pull requests! You are all magnificent. We especially acknowledge and thank A. Marki, also known as Som Snytt, who is responsible for many of the improvements in this release.

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Problem with this page? However, assuming M is a trait , it is also legal to write. Scala also has many functional programming facilities, including features found in advanced functional languages like Haskell , and tries to be agnostic between the two paradigms, letting the developer choose between the two paradigms or, more frequently, some combination thereof. This is called structural sharing. IOS Press. Apache 2. Protected visibility has qualifiers Private members of a class can be referenced from the companion module of the class and vice versa Implicit lookup generalised Typed pattern match tightened for singleton types. Similarly, an if-then-else "statement" is actually an expression, which produces a value, i. Iterating over a map returns a set of key-value tuples , and pattern-matching allows the tuples to easily be destructured into separate variables for the key and value. The following example shows the enrichment of type Int with methods isEven and isOdd :. This technique allows new methods to be added to an existing class using an add-on library such that only code that imports the add-on library gets the new functionality, and all other code is unaffected. It can be created by system. They are translated by the compiler into a series of map , flatMap and filter calls. When searching for an implicit definition matching a type T , now are considered. This release has the following notable changes affecting compatibility : Always emit Java 8 bytecode on 2.

Greetings from the Scala 3 team! We are glad to announce that Scala 3.

Standard collections library redesigned Literal types Partial type unification By-name implicits Compiler optimizations. These advances reduce the speed gap between static and dynamic typing, although a statically typed language, like Scala, is still the preferred choice when execution efficiency is very important. In Clojure, object-oriented programming is deemphasised with functional programming being the main strength of the language. There are several ways to test code in Scala. Given the class definitions. Importing the members of MyExtensions brings the implicit conversion to extension class IntPredicates into scope. The main differences are:. Schedulers are now pluggable and easier to customize. Protected members can now have a visibility qualifier, e. Enable -Xmigration while upgrading to request migration advice from the compiler. While supporting all of the object-oriented features available in Java and in fact, augmenting them in various ways , Scala also provides a large number of capabilities that are normally found only in functional programming languages.