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What's the difference between project/build.sbt and project/BuildApp.scala? Can I create any of them interchangeably?
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If you call scala, you will get whatever scala version is installed on the path of your operating system. If you call sbt console, you get the scala version configured in the sbt build (build. sbt) with all libraries that are used in the build already on the classpath.
sbt is a popular tool for compiling, running, and testing Scala projects of any size. Using a build tool such as sbt (or Maven/Gradle) becomes essential once you create projects with dependencies or more than one code file.
sbt is an open-source build tool for Scala and Java projects, similar to Apache's Maven and Ant. Its main features are: Native support for compiling Scala code and integrating with many Scala test frameworks. Continuous compilation, testing, and deployment.
No you don't need it. sbt will download Scala for you. If you install sbt-extras (basically just a script) you don't even need to download sbt : it will automatically download the sbt launcher you need.
First, equivalent to project/BuildApp.scala is build.sbt, not project/build.sbt. They are different in what they allow: .scala lets you do things .sbt doesn't, and they can be used together.
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