marekpiechut

const CLOSED = Symbol('CLOSED')
const OPEN = Symbol('OPEN')
const HALF_OPEN = Symbol('HALF_OPEN')
const MSG = 'Functionality disabled due to previous errors.'
module.exports = (asyncFn, gracePeriodMs = 3000, threshold = 1, message = MSG) => {
  let state = CLOSED
  let failures = 0
  let openedAt
  function handleSuccess(value) {
    if(state !== CLOSED) {

marekpiechut

function callBackend(url) {
  return fetch(url)
    .then(parseResponse)
}
const withCircuitBreaker = circuitBreaker(callBackend)
withCircuitBreaker('http://my.backend.com')
  .then(doSomethingWithData, handleError)

marekpiechut

const createMyType = (startVal) => {
  let name = "Magic Object"
  let magic = 32
  let val = startVal

  return {
    add: (b) => { val += magic + b },
    sub: (b) => { val += magic - b },
    getVal: () => val
  }

marekpiechut

return Object.create(baseObejct, {
  name: {
    writable: true,
    value: "Magic Object",
  },
  magic: {
    writable: true,
    value: 32,
  },
  val: {

marekpiechut

window.BENCH = ((target) => {
  const MyType = function(startVal) {
    this.val = startVal
    this.name = "Magic Object"
    this.magic = 32
  }

  MyType.prototype.add = function(b) {
    this.val += this.magic + b
    return this

marekpiechut

const MyType = function(startVal) {
  this.val = startVal
  ...
}

MyType.prototype.add = function(b) { ... }
MyType.prototype.sub = function(b) { ... }
...

for(let i = 0; i < 1000000; i++) {

marekpiechut

const createMyType = (startVal) => {
  let val = startVal
  let magic = ...
    
  return {
    add: (b) => {
      val += magic + b
    },

    sub: (b) => { ... },

marekpiechut

function test(ar) {
    return ar2 tratatat
}

marekpiechut

if (__DEV__) {
  //do dev-only stuff that's not really interesting in production
}

marekpiechut

new webpack.DefinePlugin({
  'process.env': {
    'NODE_ENV': JSON.stringify('production')
  }
})