This project contains a Conway Game of Life written in F# and running on the JVM.
There is a .sln file for editing and building the F# project.
The build uses WebSharper to compile to Javascript; the output
goes into src/main/resources, which is the resources directory
for the Scala GUI application.
The JVM code uses the Nashorn Javascript runtime to run the code.
If you look at the code, you'll see that the interaction between F# and Scala is going both ways. Mouse clicks and button clicks are passed to F# by invoking Javascript functions, and the drawing takes place by Scala passing two callbacks to the F# code -- one for clearing the screen and one for drawing a cell.
Generally things were pretty straightforward. To call an F# function
with multiple parameters from Javascript, its parameters need to
be a tuple. The only tricky case was passing the no-argument
Scala callback to F# via Javascript. Running in the debugger showed
that Javascript was trying to call the clearCanvas() method with
an undefined argument; I gave clearCanvas a bogus parameter of type
Any, which solved the problem.
The Scala jar file may be built with Gradle. Run:
gradle clean build uberjar
and then
java -jar build/libs/fsharp-jvm-life-1.0-SNAPSHOT.jar
or one of the run scripts in the root directory.