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Copy file name to clipboardExpand all lines: _getting-started/index.md
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@@ -4,197 +4,7 @@ title: Getting Started
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partof: getting-started
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languages: [ja]
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includeTOC: true
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scala3: true
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redirect_from:
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- "/getting-started.html"
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- "/scala3/getting-started.html"
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redirect_from: /getting-started.html
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---
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## Try Scala without installing anything
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To start experimenting with Scala right away, use <ahref="https://scastie.scala-lang.org/pEBYc5VMT02wAGaDrfLnyw"target="_blank">“Scastie” in your browser</a>.
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_Scastie_ is an online “playground” where you can experiment with Scala examples to see how things work, with access to all Scala compilers and published libraries.
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> Note that Scastie supports both Scala 2 and Scala 3, but it defaults
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> to Scala 3. If you are looking for a Scala 2 snippet to play with,
Installing Scala means installing various command-line tools such as the Scala compiler and build tools.
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We recommend using the Scala installer tool "Coursier" that automatically installs all the requirements, but you can still manually install each tool.
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### Using the Scala Installer (recommended way)
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The Scala installer is a tool named [Coursier](https://get-coursier.io/docs/cli-overview), whose main command is named `cs`.
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It ensures that a JVM and standard Scala tools are installed on your system.
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Install it on your system with the following instructions.
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<divclass="main-download">
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<div id="download-step-one">
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<p>Follow <a href="https://get-coursier.io/docs/cli-installation.html#native-launcher" target="_blank">the instructions to install the <code>cs</code> launcher</a> then run:</p>
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<p><code>$ ./cs setup</code></p>
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</div>
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</div>
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Along with managing JVMs, `cs setup` also installs useful command-line tools:
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- A JDK (if you don't have one already)
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- The [sbt](https://www.scala-sbt.org/) build tool
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-[Ammonite](https://ammonite.io/), an enhanced REPL
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-[scalafmt](https://scalameta.org/scalafmt/), the Scala code formatter
> Currently, `cs setup` installs the Scala 2 compiler and runner (the `scalac` and
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> `scala` commands, respectively). This is usually not an issue because most projects
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> use a build tool that works with both Scala 2 and Scala 3.
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> Nevertheless, you can install the Scala 3 compiler and runner as command-line tools
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> by running the following additional commands:
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> ```
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> $ cs install scala3-compiler
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> $ cs install scala3
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> ```
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### ...or manually
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You only need two tools to compile, run, test, and package a Scala project: Java 8 or 11,
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and sbt.
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To install them manually:
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1. if you don't have Java 8 or 11 installed, download
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Java from [Oracle Java 8](https://www.oracle.com/java/technologies/javase-jdk8-downloads.html), [Oracle Java 11](https://www.oracle.com/java/technologies/javase-jdk11-downloads.html),
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or [AdoptOpenJDK 8/11](https://adoptopenjdk.net/). Refer to [JDK Compatibility](/overviews/jdk-compatibility/overview.html) for Scala/Java compatibility detail.
Once you have installed sbt, you are ready to create a Scala project, which
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is explained in the following sections.
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To create a project, you can either use the command line or an IDE.
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If you are familiar with the command line, we recommend that approach.
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### Using the command line
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sbt is a build tool for Scala. sbt compiles, runs,
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and tests your Scala code. (It can also publish libraries and do many other tasks.)
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To create a new Scala project with sbt:
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1. `cd` to an empty folder.
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1. Run the command `sbt new scala/scala3.g8` to create a Scala 3 project, or `sbt new scala/hello-world.g8` to create a Scala 2 project.
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This pulls a project template from GitHub.
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It will also create a `target` folder, which you can ignore.
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1. When prompted, name the application `hello-world`. This will
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create a project called "hello-world".
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1. Let's take a look at what just got generated:
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-
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```
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- hello-world
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- project (sbt uses this for its own files)
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- build.properties
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- build.sbt (sbt's build definition file)
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- src
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- main
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- scala (all of your Scala code goes here)
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- Main.scala (Entry point of program) <-- this is all we need for now
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```
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More documentation about sbt can be found in the [Scala Book](/scala3/book/tools-sbt.html) (see [here](/overviews/scala-book/scala-build-tool-sbt.html) for the Scala 2 version)
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and in the official sbt [documentation](https://www.scala-sbt.org/1.x/docs/index.html)
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### With an IDE
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You can skip the rest of this page and go directly to [Building a Scala Project with IntelliJ and sbt](/getting-started/intellij-track/building-a-scala-project-with-intellij-and-sbt.html)
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## Open hello-world project
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Let's use an IDE to open the project. The most popular ones are IntelliJ and VSCode.
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They both offer rich IDE features, but you can still use [many other editors.](https://scalameta.org/metals/docs/editors/overview.html)
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### Using IntelliJ
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1. Download and install [IntelliJ Community Edition](https://www.jetbrains.com/idea/download/)
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1. Install the Scala plugin by following [the instructions on how to install IntelliJ plugins](https://www.jetbrains.com/help/idea/managing-plugins.html)
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1. Open the `build.sbt` file then choose *Open as a project*
1. Install the Metals extension from [the Marketplace](https://marketplace.visualstudio.com/items?itemName=scalameta.metals)
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1. Next, open the directory containing a `build.sbt` file (this should be the directory `hello-world` if you followed the previous instructions). When prompted to do so, select *Import build*.
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>[Metals](https://scalameta.org/metals) is a “Scala language server” that provides support for writing Scala code in VS Code and other editors like [Atom, Sublime Text, and more](https://scalameta.org/metals/docs/editors/overview.html), using the Language Server Protocol.
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>
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> Under the hood, Metals communicates with the build tool by using
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> the [Build Server Protocol (BSP)](https://build-server-protocol.github.io/). For details on how Metals works, see, [“Write Scala in VS Code, Vim, Emacs, Atom and Sublime Text with Metals”](https://www.scala-lang.org/2019/04/16/metals.html).
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### Play with the source code
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View these two files in your IDE:
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- _build.sbt_
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- _src/main/scala/Main.scala_
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When you run your project in the next step, the configuration in _build.sbt_ will be used to run the code in _src/main/scala/Main.scala_.
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## Run Hello World
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If you’re comfortable using your IDE, you can run the code in _Main.scala_ from your IDE.
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Otherwise, you can run the application from a terminal with these steps:
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1. `cd` into `hello-world`.
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1. Run `sbt`. This opens up the sbt console.
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1. Type `~run`. The `~` is optional and causes sbt to re-run on every file save,
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allowing for a fast edit/run/debug cycle. sbt will also generate a `target` directory
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which you can ignore.
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-
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When you’re finished experimenting with this project, press `[Enter]` to interrupt the `run` command.
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Then type `exit` or press `[Ctrl+D]` to exit sbt and return to your command line prompt.
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## Next Steps
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Once you've finished the above tutorials, consider checking out:
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* [The Scala Book](/scala3/book/introduction.html) (see the Scala 2 version [here](/overviews/scala-book/introduction.html)), which provides a set of short lessons introducing Scala’s main features.
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* [The Tour of Scala](/tour/tour-of-scala.html) for bite-sized introductions to Scala's features.
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* [Learning Resources](/learn.html), which includes online interactive tutorials and courses.
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* [Our list of some popular Scala books](/books.html).
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* [The migration guide](/scala3/guides/migration/compatibility-intro.html) helps you to migrate your existing Scala 2 code base to Scala 3.
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## Getting Help
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There are a multitude of mailing lists and real-time chat rooms in case you want to quickly connect with other Scala users. Check out our [community](https://scala-lang.org/community/) page for a list of these resources, and for where to reach out for help.
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-
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<!-- Hidden elements whose content are used to provide OS-specific download instructions.
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-
-- This is handled in `resources/js/functions.js`.
<p>Follow <a href="https://get-coursier.io/docs/cli-installation" target="_blank">the instructions to install the <code>cs</code> launcher</a> then run:</p>
To start experimenting with Scala right away, use <ahref="https://scastie.scala-lang.org/pEBYc5VMT02wAGaDrfLnyw"target="_blank">“Scastie” in your browser</a>.
4
+
_Scastie_ is an online “playground” where you can experiment with Scala examples to see how things work, with access to all Scala compilers and published libraries.
5
+
6
+
> Note that Scastie supports both Scala 2 and Scala 3, but it defaults
7
+
> to Scala 3. If you are looking for a Scala 2 snippet to play with,
Installing Scala means installing various command-line tools such as the Scala compiler and build tools.
13
+
We recommend using the Scala installer tool "Coursier" that automatically installs all the requirements, but you can still manually install each tool.
14
+
15
+
### Using the Scala Installer (recommended way)
16
+
17
+
The Scala installer is a tool named [Coursier](https://get-coursier.io/docs/cli-overview), whose main command is named `cs`.
18
+
It ensures that a JVM and standard Scala tools are installed on your system.
19
+
Install it on your system with the following instructions.
20
+
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+
<divclass="main-download">
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+
<div id="download-step-one">
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+
<p>Follow <a href="https://get-coursier.io/docs/cli-installation.html#native-launcher" target="_blank">the instructions to install the <code>cs</code> launcher</a> then run:</p>
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<p><code>$ ./cs setup</code></p>
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</div>
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+
</div>
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+
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+
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+
Along with managing JVMs, `cs setup` also installs useful command-line tools:
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+
31
+
- A JDK (if you don't have one already)
32
+
- The [sbt](https://www.scala-sbt.org/) build tool
33
+
-[Ammonite](https://ammonite.io/), an enhanced REPL
34
+
-[scalafmt](https://scalameta.org/scalafmt/), the Scala code formatter
> Currently, `cs setup` installs the Scala 2 compiler and runner (the `scalac` and
42
+
> `scala` commands, respectively). This is usually not an issue because most projects
43
+
> use a build tool that works with both Scala 2 and Scala 3.
44
+
> Nevertheless, you can install the Scala 3 compiler and runner as command-line tools
45
+
> by running the following additional commands:
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+
> ```
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+
> $ cs install scala3-compiler
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+
> $ cs install scala3
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+
> ```
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+
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+
### ...or manually
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+
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+
You only need two tools to compile, run, test, and package a Scala project: Java 8 or 11,
54
+
and sbt.
55
+
To install them manually:
56
+
57
+
1. if you don't have Java 8 or 11 installed, download
58
+
Java from [Oracle Java 8](https://www.oracle.com/java/technologies/javase-jdk8-downloads.html), [Oracle Java 11](https://www.oracle.com/java/technologies/javase-jdk11-downloads.html),
59
+
or [AdoptOpenJDK 8/11](https://adoptopenjdk.net/). Refer to [JDK Compatibility](/overviews/jdk-compatibility/overview.html) for Scala/Java compatibility detail.
Once you have installed sbt, you are ready to create a Scala project, which
65
+
is explained in the following sections.
66
+
67
+
To create a project, you can either use the command line or an IDE.
68
+
If you are familiar with the command line, we recommend that approach.
69
+
70
+
### Using the command line
71
+
72
+
sbt is a build tool for Scala. sbt compiles, runs,
73
+
and tests your Scala code. (It can also publish libraries and do many other tasks.)
74
+
75
+
To create a new Scala project with sbt:
76
+
77
+
1. `cd` to an empty folder.
78
+
1. Run the command `sbt new scala/scala3.g8` to create a Scala 3 project, or `sbt new scala/hello-world.g8` to create a Scala 2 project.
79
+
This pulls a project template from GitHub.
80
+
It will also create a `target` folder, which you can ignore.
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+
1. When prompted, name the application `hello-world`. This will
82
+
create a project called "hello-world".
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+
1. Let's take a look at what just got generated:
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+
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+
```
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+
- hello-world
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+
- project (sbt uses this for its own files)
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+
- build.properties
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+
- build.sbt (sbt's build definition file)
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+
- src
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+
- main
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+
- scala (all of your Scala code goes here)
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+
- Main.scala (Entry point of program) <-- this is all we need for now
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+
```
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+
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+
More documentation about sbt can be found in the [Scala Book](/scala3/book/tools-sbt.html) (see [here](/overviews/scala-book/scala-build-tool-sbt.html) for the Scala 2 version)
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+
and in the official sbt [documentation](https://www.scala-sbt.org/1.x/docs/index.html)
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+
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+
### With an IDE
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+
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You can skip the rest of this page and go directly to [Building a Scala Project with IntelliJ and sbt](/getting-started/intellij-track/building-a-scala-project-with-intellij-and-sbt.html)
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+
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+
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## Open hello-world project
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+
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+
Let's use an IDE to open the project. The most popular ones are IntelliJ and VSCode.
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+
They both offer rich IDE features, but you can still use [many other editors.](https://scalameta.org/metals/docs/editors/overview.html)
108
+
109
+
### Using IntelliJ
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+
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+
1. Download and install [IntelliJ Community Edition](https://www.jetbrains.com/idea/download/)
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+
1. Install the Scala plugin by following [the instructions on how to install IntelliJ plugins](https://www.jetbrains.com/help/idea/managing-plugins.html)
113
+
1. Open the `build.sbt` file then choose *Open as a project*
1. Install the Metals extension from [the Marketplace](https://marketplace.visualstudio.com/items?itemName=scalameta.metals)
119
+
1. Next, open the directory containing a `build.sbt` file (this should be the directory `hello-world` if you followed the previous instructions). When prompted to do so, select *Import build*.
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+
121
+
>[Metals](https://scalameta.org/metals) is a “Scala language server” that provides support for writing Scala code in VS Code and other editors like [Atom, Sublime Text, and more](https://scalameta.org/metals/docs/editors/overview.html), using the Language Server Protocol.
122
+
>
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+
> Under the hood, Metals communicates with the build tool by using
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+
> the [Build Server Protocol (BSP)](https://build-server-protocol.github.io/). For details on how Metals works, see, [“Write Scala in VS Code, Vim, Emacs, Atom and Sublime Text with Metals”](https://www.scala-lang.org/2019/04/16/metals.html).
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+
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+
### Play with the source code
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+
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+
View these two files in your IDE:
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+
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+
- _build.sbt_
131
+
- _src/main/scala/Main.scala_
132
+
133
+
When you run your project in the next step, the configuration in _build.sbt_ will be used to run the code in _src/main/scala/Main.scala_.
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+
135
+
## Run Hello World
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+
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+
If you’re comfortable using your IDE, you can run the code in _Main.scala_ from your IDE.
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+
139
+
Otherwise, you can run the application from a terminal with these steps:
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+
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+
1. `cd` into `hello-world`.
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+
1. Run `sbt`. This opens up the sbt console.
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+
1. Type `~run`. The `~` is optional and causes sbt to re-run on every file save,
144
+
allowing for a fast edit/run/debug cycle. sbt will also generate a `target` directory
145
+
which you can ignore.
146
+
147
+
When you’re finished experimenting with this project, press `[Enter]` to interrupt the `run` command.
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+
Then type `exit` or press `[Ctrl+D]` to exit sbt and return to your command line prompt.
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+
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+
## Next Steps
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+
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+
Once you've finished the above tutorials, consider checking out:
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+
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+
* [The Scala Book](/scala3/book/introduction.html) (see the Scala 2 version [here](/overviews/scala-book/introduction.html)), which provides a set of short lessons introducing Scala’s main features.
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+
* [The Tour of Scala](/tour/tour-of-scala.html) for bite-sized introductions to Scala's features.
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+
* [Learning Resources](/learn.html), which includes online interactive tutorials and courses.
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+
* [Our list of some popular Scala books](/books.html).
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+
* [The migration guide](/scala3/guides/migration/compatibility-intro.html) helps you to migrate your existing Scala 2 code base to Scala 3.
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+
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+
## Getting Help
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+
There are a multitude of mailing lists and real-time chat rooms in case you want to quickly connect with other Scala users. Check out our [community](https://scala-lang.org/community/) page for a list of these resources, and for where to reach out for help.
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+
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+
<!-- Hidden elements whose content are used to provide OS-specific download instructions.
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+
-- This is handled in `resources/js/functions.js`.
<p>Follow <a href="https://get-coursier.io/docs/cli-installation" target="_blank">the instructions to install the <code>cs</code> launcher</a> then run:</p>
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