How to write hello world

Objective

I want to write a hello world program in Scala, and run it.

Steps

Create a fresh directory, like hello_scala/
Create a directory named project/ under hello_scala/, and create project/build.properties with
```
sbt.version=2.0.0-M2
```
Under hello_scala/, create build.sbt:
```
scalaVersion := "3.3.3"
```

Under hello_scala/, create Hello.scala:

 @main def main(args: String*): Unit =
   println(s"Hello ${args.mkString}")

Navigate to hello_scala/ from the terminal, and run sbt:
```
$ sbt
```
When the prompt appears, type run:
```
sbt:hello_scala> run
```
Type exit to exit the sbt shell:
```
sbt:hello_scala> exit
```

Alternatives

When you're in a hurry, you can run sbt init in a fresh directory, and select the first template.