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var printObj = typeof JSON != 'undefined' ? JSON.stringify : function(obj) {
	var arr = [];
	$.each(obj, function(key, val) {
		var next = key + ': ';
		next += $.isPlainObject(val) ? printObj(val) : val;
		arr.push(next);
	});
	return '{ ' + arr.join(', '); + ' }';
}

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function log(obj) {
  console.log(obj);
}

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// connect() is a function that injects Redux-related props into your component.
// You can inject data and callbacks that change that data by dispatching actions.
function connect(mapStateToProps, mapDispatchToProps) {
  // It lets us inject component as the last step so people can use it as a decorator.
  // Generally you don't need to worry about it.
  return function (WrappedComponent) {
    // It returns a component
    return class extends React.Component {
      render() {
        return (

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function* fibonacci() {
  let [prev, curr] = [0, 1];
  
  // using deconstruct feature implement reducer, really cool...
  for (;;) {
    [prev, curr] = [curr, curr + prev];
    yield curr;
  }
}

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const createStore = (reducer) => {
  // only this place create the one and only state
  let state
  let listeners = []
  
  const getState = () => state
  
  const dispatch = (action) => {
    // change state only by dispatching an action
    state = reducer(state, action)

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// accept a array of reducers
const combineReducers = (reducers) => {
  // returns a huge reducer, looks like below gist
  return (state = {}, action) => {
    return Object.keys(reducers).reduce(
      (nextState, key) => {
        nextState[key] = reducers[key](
          state[key],
          action
        )

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// pre es5
function isEmpty(myObject) {
  for (var key in myObject) {
    if (myObject.hasOwnProperty(key)) {
      return false
    }
  }
  
  return true 
}  

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.DS_Store
*.log
dist
node_modules
.sass-cache
.svn
.gitmodules

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// cause safari private mode do not support storage

if (typeof localStorage === 'object') {
  try {
    localStorage.setItem('localStorage', 1);
    localStorage.removeItem('localStorage');
  } catch (e) {
    Storage.prototype._setItem = Storage.prototype.setItem; 
    Storage.prototype.setItem = function() {};
    alert('你的浏览器似乎不支持本地缓存，如果你是Safari用户，请关闭“无痕浏览”模式');

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function add(getX, getY, cb) {
  var x, y;
  getX(function(xVal) {
    x = xVal;
    if (y !== undefined) {
      cb(x + y);
    }
  });
  get(function(yVal) {