Intro Scala

SBT Commands

Enter SBT interactive shell

$ sbt

Common useful operations:

• projects: List all projects and mark the current one
• project <NAME>: Switch the current project to
• clean: Deletes all generated files from compilation
• compile: Compiles the main sources (in src/main/scala) of the current project
• console: Open the REPL with the current project loaded
• run: Run the main (in src/main/scala) of the current project
• test: Compiles (main and test sources) and runs all tests
• testOnly: Compiles (main and test sources) and runs matching tests
• scalafmtAll: Format code for all configurations and projects

Run multiple commands:

>;clean;compile;test

Prepend ~ to any command to run it in watch mode. It can be used with one command:

>~test

or with many commands:

>~;scalafmtAll;clean;test

SBT Aliases

From the SBT interactive shell:

• c: Compiles the main sources (in src/main/scala) of the current project
• cc: Clean and compiles the main sources (in src/main/scala) of the current project
• cn: Open the REPL with the current project loaded
• r: Run the main (in src/main/scala) of the current project
• t: Compiles (main and test sources) and runs all tests
• to: Compiles (main and test sources) and runs matching tests
• fm: Format code for all configurations and projects

Documentation

Useful documentations:

• Scala
• Scala Standard Library
• Tour of Scala
• SBT
• Metals
• Scalafmt
• MUnit
• Scastie - Scala Online REPL