zhongyangxun zhongyangxun

## MyPromise.js
// Promise A+: https://promisesaplus.com/

function MyPromise(fn) {
  this.status = 'pending';
  this.value = null;
  this.callbacks = [];

  this.resolve = (newVal) => {
    const fn = () => {
      if (this.status !== 'pending') {

## myRedux.js
function createStore(state, reducer) {
  const listeners = [];

  const getState = () => state;

  const dispatch = (action) => {
    state = reducer(state, action);
    listeners.forEach((item) => item());
  }

## concurrent-request.html
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Concurrent request</title>
  </head>
  <body>
    <button id="fetch">fetch</button>

## shuffle.js
function shuffle(arr) {
  if (!arr || arr.length === 0) {
    return [];
  }

  if (arr.length === 1) {
    return [...arr];
  }

  const map = new Map();
	// Promise A+: https://promisesaplus.com/

	function MyPromise(fn) {
	this.status = 'pending';
	this.value = null;
	this.callbacks = [];

	this.resolve = (newVal) => {
	const fn = () => {
	if (this.status !== 'pending') {
	function createStore(state, reducer) {
	const listeners = [];

	const getState = () => state;

	const dispatch = (action) => {
	state = reducer(state, action);
	listeners.forEach((item) => item());
	}
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8" />
	<meta http-equiv="X-UA-Compatible" content="IE=edge" />
	<meta name="viewport" content="width=device-width, initial-scale=1.0" />
	<title>Concurrent request</title>
	</head>
	<body>
	<button id="fetch">fetch</button>
	function shuffle(arr) {
	if (!arr \|\| arr.length === 0) {
	return [];
	}

	if (arr.length === 1) {
	return [...arr];
	}

	const map = new Map();