Scala version

Please consult the Scala 2. A class may now extend AnyVal to make it behave like a struct type restrictions apply.

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.

Scala version

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:. Each Scala release has its own page listing alternative installation methods. Click the button above to see the full list of Scala releases, or pick from the most recent releases below. Install Scala with cs setup recommended To install Scala, it is recommended to use cs setup , the Scala installer powered by Coursier.

Scala is a pure object-oriented language in the sense that every value is an object. July Commands can also scala version entered directly into the Scala interpreter, using the option -e :.

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, or the compiler itself will make the change if run again with -quickfix. Library authors should be aware that the behavior of -doc-source-url has changed, as follows:. 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.

Greetings from the Scala 3 team! We are glad to announce that Scala 3. As no critical bugs have been found in the previously released Scala 3. Recently, we are more and more confident that we can release stable versions of the compiler frequently and regularly. So, we have decided that the blog posts should focus more on stable features available for all users in the latest release of scala. So here, as a refresher, you have a summary of the most significant changes introduced in 3. As it gets broader adoption, we consistently improve its specification to eliminate corner cases which might lead to ambiguities or counterintuitive behaviours. Thanks to it is now allowed for a logical expression in an if statement or expression to continue in the following line if it starts in the same line as the if keyword, e.

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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Changes in Version 2. The new recommended way to write a top-level application is like this:. There are several ways to test code in Scala. Evaluation is strict "eager" by default. This technique enables to significantly reduce the compilation time on bigger projects. Scala version 2. Another major addition is the first beta version of the ScalaSwing library, which is now bundled with the distribution. Non-strict collections provide a good semantic fit to things like server-produced data, where the evaluation of the code to generate later elements of a list that in turn triggers a request to a server, possibly located somewhere else on the web only happens when the elements are actually needed. By contrast, dynamic typing requires more testing to ensure program correctness, and thus is generally slower, to allow greater programming flexibility and simplicity. Scala is a pure object-oriented language in the sense that every value is an object. The IDE has been extensively reworked with much functionality moved into the Scala compiler where it can be better maintained and reused by non-Eclipse IDEs and other tools. Each Scala release has its own page listing alternative installation methods. To ensure upgradability of Scala codebases, extraneous type parameters for Java classes under scalac -target:jvm Functional programming languages commonly provide tail call optimization to allow for extensive use of recursion without stack overflow problems. Problem with this page?

Scala lets you write less to do more. As a high-level language, its modern features increase productivity and lead to more readable code.

Retrieved 4 July Scala is equipped with an expressive static type system that mostly enforces the safe and coherent use of abstractions. Proceedings of the 12th annual international conference on Aspect-oriented software development. In other words, the call to draw first executed the code in TitleDecoration the last trait mixed in , then through the super calls threaded back through the other mixed-in traits and eventually to the code in Window , even though none of the traits inherited from one another. Contents move to sidebar hide. Handling of arrays has been simplified and optimized in Scala 2. On platforms with the necessary runtime support, :javap will disassemble any class including repl-defined ones. For instance, given the case class:. To make it clear that all functions are expressions, even methods that return Unit are written with an equals sign. Mountain View, California: Artima. There are several ways to test code in Scala. Tooling such as IDEs can then offer the edits, or the compiler itself will make the change if run again with -quickfix. Given the class definitions. After an internal release in late , Scala was released publicly in early on the Java platform , [15] [7] [14] [16] A second version v2.