More info about Reactive Ruby can be found here: https://guidosalva.github.io/ReactiveRubyTruffle/

Reactive Ruby is an experimental reactive language, which extends Truffle Ruby.

Reactive Ruby should be executed on the Graal VM instead of the normal Java VM.

Install the Graal VM

A guide on how to install the Graal VM: https://wiki.openjdk.java.net/display/Graal/Instructions

Reactive Ruby

git clone git@github.com:guidosalva/ReactiveRubyTruffle.git
cd ReactiveRubyTruffle
mvn

The jt tool can be used to execute Reactive Ruby programs. (See: https://github.com/jruby/jruby/tree/master/truffle#workflow-tool)

jt run --graal examples/time.rb executes the following example which prints the current time every second.

time = timeB(1) 
time.onChange { |x| puts x}

jt run --graal examples/sum.rb executes the next example, which demonstrates some operators.

range = rangeB(1,100)

even = range.filter(0) { | x | 
	x.to_i % 2 == 0
}

sum = even.fold( 0 ) { |acc, val| 
	acc + val
}

combine = range.map(sum) { | x, y | [x,y] }

combine.onChange {|x| puts "sum: #{x}"}

The output is:

sum: [2, 2]
sum: [3, 2]
sum: [4, 6]
sum: [5, 6]
sum: [6, 12]
sum: [7, 12]
sum: [8, 20]
sum: [9, 20]
sum: [10, 30]
...