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Running Rascal

rascal-0.41.2

Running Rascal: starting a terminal with a read-eval-print-loop​

  1. On the Unix or Windows Commandline, start a Rascal Shell by: java -jar rascal-<version>.jar
  2. In VS Code, in the command palette type Rascal and select Create Rascal Terminal
  3. With Maven, Create New Project first and then type: mvn rascal:console

You will be prompted for input right after the version is printed and a lot of information about the current searchpath configuration.

Exit the terminal REPL​

Here we show how to quit the terminal:

:quit

Similarly you could type CTRL+D which indicates end-of-file to terminate the process.

Now what?​

More information about the features of the shell can be found here. At the prompt you can type Expressions, Statements and Declarations.

rascal>1 + 1
int: 2
rascal>myList = [ i | i <- [1..11], i % 2 == 0];
list[int]: [2,4,6,8,10]
rascal>import Prelude;
ok
rascal>println("Hello <myList> is <size(myList)> long");
Hello [2,4,6,8,10] is 5 long
ok

Next you could create a new Rascal project to start writing Rascal code.