MacPorts is an easy way to install and manage Scala on the Mac. Once MacPorts is installed, you can install Scala using:
sudo port install scala
Sudo will ask for your password. Wait. Done.
Once installed, you may want to know where it was installed. For example, you may need to set the SCALA_HOME environment variable. Just do
port [...]
Continue reading about Installing Scala on Macs via MacPorts