Circular dependencies with RxJS. Spore modeling

Question

I am trying to simulate some game with RxJS. but I found some issues with circular dependencies. So, I simplified my game to simple modeling (I left only the “move” action). You can find the code below (I missed some parts, you can find the repo here )

const rx = require('rx')
const math = require('mathjs')
const _ = require('underscore')

const FIELD_SIZE = 10

const ctx = require('axel');

let getInitialState = () => {
  return {
    size: FIELD_SIZE,
    people: [
      { x: 0, y: 0 },
      { x: 9, y: 9 },
      { x: 5, y: 5 }
    ]
  }
}

var drawWorld = ({size, people}) => {
  // draw world logic
}


let getMove = (index)=> {
  let [xOffset, yOffset] = [[0,1], [1,0]][math.pickRandom([0, 1])]
  let direction = math.pickRandom([-1, 1])
  return (state) => {
    let {people} = state
    let p = people[index]
    people[index] = {
      x: math.max(
          0,
          math.min(p.x + xOffset * direction, FIELD_SIZE-1)),
      y: math.max(
          0,
          math.min(p.y + yOffset * direction, FIELD_SIZE-1))
    }
    return _.extend({}, state, {people})
  }
}

var POOL = []

var produceActions = (state) => {
  _.range(state.people.length).forEach((i) => {
    POOL.push(getMove(i))
  })
}

var stateObservable = rx.Observable
  .interval(100)
  .timeInterval()
  .map(()=> {
    var x = POOL.slice()
    POOL.splice(0, POOL.length)
    return x
  })
  .scan(
      (state, ops) => ops.reduce(
        (st, o) => o(st),
        state
      ),
      getInitialState()
  )

stateObservable.subscribe(drawWorld)
stateObservable.tap(produceActions).subscribe()

Is there a way to rewrite this ugly part of `productionActions' that relies on a global variable? As suggested in @ user3743222's answer

Answer 1

, , , . , , , . , , , ES6.

- POOL:

var POOL_proxyS = new Rx.BehaviorSubject([]); // instead of var POOL = []

var stateObservable = rx.Observable
  .interval(100)
  .timeInterval()
  .combineLatest(POOL_proxyS, (_, POOL) => POOL.slice() )
  .scan(
      (state, ops) => ops.reduce(
        (st, o) => o(st),
        state
      ),
      getInitialState()
  );

var produceActions = (state) => _.range(state.people.length).map((i) => getMove(i));

stateObservable
  .do(drawWorld)
  .map(produceActions)
  .subscribe(POOL_proxyS);

Answer 2

, .

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