Scala version

Designed to be concise, [9] many of Scala's design decisions are intended to address criticisms of Scala version. Scala can also be compiled to JavaScript to run in a browser, or directly to a native executable.

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.

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.

This section summarizes the main changes.

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.

If you are having trouble with setting up Scala, feel free to ask for help in the scala-users channel of our Discord. Installing Scala means installing various command-line tools such as the Scala compiler and build tools. The Scala installer is a tool named Coursier , whose main command is named cs. It ensures that a JVM and standard Scala tools are installed on your system. Install it on your system with the following instructions. 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. You may need to restart your terminal, log out, or reboot in order for the changes to take effect.

Scala version

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. Safe, scalable, and principled concurrency. Reliable data validation with powerful transformations.

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In Scala, this technique involves declaring an implicit conversion from the type "receiving" the method to a new type typically, a class that wraps the original type and provides the additional method. Functions that would be declared as returning void in C or Java, and statements like while that logically do not return a value, are in Scala considered to return the type Unit , which is a singleton type , with only one object of that type. Similarly, the result of the comprehension also returns key-value tuples, which are automatically built back up into a map because the source object from the variable mentions is a map. The support for attributes has been extended and its syntax changed. This definition of Iterable makes explicit that mapping a function over a certain structure e. Retrieved 31 July In the edition of the State of Java survey, [] which collected data from developers on various Java-related topics, Scala places third in terms of use of alternative languages on the JVM. Archived from the original on 13 January Nothing and Null available since 2. The TIOBE index [] of programming language popularity employs internet search engine rankings and similar publication-counting to determine language popularity.

For the complete 2. As usual for our minor releases, Scala 2.

It is now possible to initialize some fields of an object before any parent constructors are called. A function may optionally be annotated with tailrec , in which case it will not compile unless it is tail recursive. Here is an example:. Manning Publications. An example of this is immutable linked lists where prepending an element to a list is done by returning a new list node consisting of the element and a reference to the list tail. Marki, also known as Som Snytt, who is responsible for a large share of the improvements in this release. Consider for instance the statement below:. Retrieved on Scala now supports Java generic types by default:. You switched accounts on another tab or window.