Scala version

For some errors and warnings, the compiler now suggests an edit that could fix the scala version. Tooling such as IDEs can then offer the edits, 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.

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. Run the following command in your terminal, following the on-screen instructions.

Note that if mentions instead held a list, set, array or other collection of tuples, exactly the same code above would yield a new collection of the same type, 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.

Scala lets you write less to do more. As a high-level language, its modern features increase productivity and lead to more readable code. With Scala, you can combine both functional and object-oriented programming styles to help structure programs. Scala is well suited to building fast, concurrent, and distributed systems with its JVM, JavaScript and Native runtimes. Scala prioritises interoperability, giving easy access to many ecosystems of industry-proven libraries. Scala's static types help you to build safe systems by default. Smart built-in checks and actionable error messages, combined with thread-safe data structures and collections, prevent many tricky bugs before the program first runs. High-throughput HTTP servers and clients.

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.

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You signed in with another tab or window. A long-running repl command can now be interrupted via ctrl-C without terminating the repl session. It now gives better feedback to the user during lengthy downloads and while diagnosing dependency audits, which in turn have been re-factored and enhanced. SethTisue Seth Tisue. Type parameters and abstract type members can now also abstract over type constructors. In other projects. This is particularly useful for traits, which do not have normal constructor parameters. The code above shows some of the conceptual differences between Java and Scala's handling of classes:. Reload to refresh your session. Scala's operational characteristics are the same as Java's. It installs everything necessary to use the latest Scala release from a command line:. In this case, all method arguments are written as a normal parameter list in parentheses. The method to is rather defined in the standard Scala library as an extension method on integers, using a technique known as implicit conversions [32] that allows new methods to be added to existing types. For any other target, Java generics are not recognized.

If you are having trouble with setting up Scala, feel free to ask for help in the scala-users channel of our Discord.

The Scala compiler generates now for every case class a companion extractor object. See the actors migration project for more information. Functions and operators that never return at all e. The following example shows the differences between Java and Scala syntax. Lightbend offers commercial support for Scala. It is now possible to define existential types using the new keyword forSome. However, we can still call this variable exactly as if it were a normal function:. Revision the common, uniform, and all-encompassing framework for collection types. Retrieved 16 July 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. Instead of the Java " foreach " loops for looping through an iterator, Scala has for -expressions, which are similar to list comprehensions in languages such as Haskell, or a combination of list comprehensions and generator expressions in Python.