FizzBuzz based on nools.js

fizzbuzz.js

'use strict';

const nl = require('nools');

class Message {

  constructor() {
    this.text = '';
  }

  set append(text) {
    this.text = this.text + text;
  }

  get value() {
    return this.text;
  }
}

let flow;
let session;

nl.deleteFlow('FizzBuzz');

flow = nl.flow("FizzBuzz", function(flow) {

  flow.rule("FizzBuzz", {salience: 3}, [
    [Number, 'num', "num % 15 == 0"]
  ], function (facts) {
    console.log(facts.num, 'FizzBuzz');
    this.retract(facts.num);
  });

  flow.rule("Fizz", {salience: 1}, [
    [Number, 'num', "num % 3 == 0"],
  ], function (facts) {
    console.log(facts.num, 'Fizz');
    this.retract(facts.num);
  })

  flow.rule("Buzz", {salience: 2}, [
    [Number, 'num', "num % 5 == 0"],
  ], function (facts) {
    console.log(facts.num, 'Buzz');
    this.retract(facts.num);
  })

});

session = flow.getSession();

for (let i = 1; i<100; i++) {
  session.assert(i);
}

session.match().then(
  function(){
    console.log("Done");
  },
  function(err){
    //uh oh an error occurred
    console.error(err.stack);
  });