Hello world

Using sbt new command to create an simple project:

sbt new sbt/scala-seed.g8

Follow the prompt information, Input the project name to finish the setup:

A minimal Scala project.

name [Scala Seed Project]: scala-walk-through

Template applied in ./scala-walk-through

Now we have a basic project, check the directories structure:

ls -l scala-walk-through
total 8
-rw-r--r--  1 kcsun  staff  282 Jan  3 12:00 build.sbt
drwxr-xr-x  4 kcsun  staff  136 Jan  3 12:00 project
drwxr-xr-x  4 kcsun  staff  136 Jan  3 12:00 src

Let me explain the files:

• build.sbt - the project configuration file, it includes basic information for the project like project name, group name, scala version, dependencies, etc.

• project - this folder contains the file

  • build.properties used to set sbt version

  • plugins.sbt used to define all the available plugins for the build

  • Other project settings you want to extract from the build.sbt to make the main file clean and tight.

• src - this folder maintains all the source code and test code. sbt has the same code structure style with Maven.

Modify the source code insrc/main/scala/example/Hello.scala to be:

lazy val greeting: String = "Hello, Functional Programming!"

Run your newest program with sbt command, you can use sbt run directly, or get into interactive mode with sbt, then execute run. You will get following output if you are lucky:

Hello, Functional Programming!

Exit sbt with ctrl + d or simply input exit.