How to Check Scala Version in Scala

1. Method 1: Using the Scala Command Line
2. Method 2: Using the Scala REPL
3. Method 3: Checking the Build Tool Configuration
4. Conclusion
5. FAQ

Scala is a powerful programming language that combines object-oriented and functional programming paradigms. Whether you’re a seasoned developer or just starting your journey with Scala, knowing how to check the version installed on your local machine is crucial. This knowledge helps ensure compatibility with libraries, frameworks, and other tools you might be using.

In this article, we will explore various methods to check the Scala version on your computer. We’ll keep things straightforward and informative, providing you with a clear understanding of each method. So, let’s dive in and discover how to check the Scala version effectively!

Method 1: Using the Scala Command Line

One of the simplest ways to check the Scala version is by using the command line. If you have Scala installed on your system, you can easily access its version information through a straightforward command. Here’s how you can do it:

Open your terminal or command prompt and type the following command:

scala -version

Output:

Scala code runner version 2.13.6 -- Copyright 2002-2021, LAMP/EPFL

When you run this command, the terminal will display the Scala version along with some additional copyright information. This method is quick and effective, making it a go-to for many developers. If you encounter an error saying that the command is not recognized, it may indicate that Scala is not installed or not added to your system’s PATH. In that case, you may need to install Scala or configure your environment variables appropriately.

This command works across different operating systems, including Windows, macOS, and Linux, making it universally applicable for anyone working with Scala.

Method 2: Using the Scala REPL

Another handy method for checking your Scala version is to use the Scala REPL (Read-Eval-Print Loop). The REPL is an interactive shell that allows you to execute Scala code snippets in real-time. Here’s how you can check the version using the REPL:

First, launch the Scala REPL by typing the following command in your terminal:

scala

Once inside the REPL, type the command:

util.Properties.versionString

Output:

version 2.13.6

After executing this command, the REPL will return the version of Scala currently in use. This method not only provides you with the version number but also allows you to experiment with Scala code in an interactive environment. If you’re learning Scala, the REPL can be an excellent tool for testing out ideas and concepts on the fly.

If you ever need to exit the REPL, simply type :quit or press Ctrl+D. This method is particularly useful for developers who prefer a hands-on approach and want to explore Scala features while checking the version.

Method 3: Checking the Build Tool Configuration

If you are using a build tool like SBT (Scala Build Tool) or Maven for your Scala projects, you can also check the Scala version specified in your project configuration files. This method is particularly useful for projects that rely on specific Scala versions. Here’s how to find the version in both SBT and Maven:

For SBT

Open your build.sbt file and look for the line that specifies the Scala version. It typically looks like this:

scalaVersion := "2.13.6"

Output:

2.13.6

In this case, the version number is clearly indicated. If you need to check the version for a project, this is a reliable method since it reflects the version used during project compilation.

For Maven

If you’re using Maven, check the pom.xml file for the Scala version. Look for the following snippet:

<properties>
    <scala.version>2.13.6</scala.version>
</properties>

Output:

2.13.6

This method is particularly useful for teams working on collaborative projects, ensuring that everyone is on the same page regarding the Scala version being used.

Both of these methods are effective for verifying the Scala version in the context of specific projects. They help maintain consistency across development environments and prevent compatibility issues down the line.

Conclusion

In conclusion, checking the Scala version on your local computer is a straightforward process that can be accomplished in various ways. Whether you prefer using the command line, the Scala REPL, or inspecting your build tool configurations, each method provides you with the necessary information to ensure compatibility with your projects. By knowing your Scala version, you can effectively manage dependencies and avoid potential issues that arise from version mismatches. Remember, staying informed about your development environment is key to successful programming. Happy coding!

FAQ

1. How do I install Scala on my computer?
   You can install Scala by downloading it from the official Scala website or using a package manager like Homebrew for macOS or SDKMAN for Linux.

2. Can I check the Scala version in an IDE?
   Yes, most IDEs like IntelliJ IDEA display the Scala version in the project settings or the build tool configuration.

3. What should I do if the Scala command is not recognized?
   Ensure that Scala is installed correctly and that its bin directory is added to your system’s PATH.

4. Is there a difference between Scala and Scala.js?
   Yes, Scala.js is a variant of Scala that compiles to JavaScript, allowing you to write Scala code that runs in web browsers.

5. Can I have multiple Scala versions installed?
   Yes, you can manage multiple Scala versions using tools like SDKMAN or by configuring your build tool to specify different Scala versions for different projects.