For someone who knows Scala the tutorial at
http://www.scala-js.org/tutorial/basic/ seems pretty thorough.
But the short answer is yes.
There's also this: https://github.com/vmunier/play-with-scalajs-example
And then if you want something interactive but with low commitment, you can give the examples in Typesafe Activator a spin:
$ brew install typesafe-activator
$ activator ui
That'll open a browser window. Form there you can open tutorials, step through them while a code panel gets highlighted as you go, edit code in-browser, execute tests and run. All from a single app running in your browser with a 30 second install. It's gotta be the lowest friction intro/development environment ever conceived. Highly recommended if you've never seen it.