Producer-Consumer Problem Solved with JavaScript

producer_consumer.js

import { EventEmitter } from 'events'

let cycle = 0

let emitter = new EventEmitter

emitter.on( 'produce', function(v) { console.log(`produce ${v}`) } )
emitter.on( 'consume', function(v) { console.log(`consume ${v}`) } )

emitter.on( 'full',    function(arr)  { consumer(arr).next() } )
emitter.on( 'empty',   function(arr)  { producer(arr).next() } )

function produce(arr, from = 0, to = 10) {
  switch (from) {
    case to: emitter.emit('full', arr)     ; return
    default: emitter.emit('produce', from) ; produce( (arr.push(from), arr), from + 1, to )
  }
}

function consume(arr) {
  switch (arr.length) {
    case  0: emitter.emit('empty', arr)      ; return
    default: emitter.emit('consume', arr[0]) ; consume( (arr.shift(), arr) )
  }
}

function* producer(arr) {
  switch (cycle) {
    case  2: return
    default: cycle += 1 ; produce(arr)
  }
}

function* consumer(arr) {
  consume(arr)
}

export { producer }

// Usage:
// import { producer } from './producer_consumer.js'
// producer([]).next()