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The 0.13.0 improvements to React Components are often framed as "es6 classes" but being able to use the new class syntax isn't really the big change. The main thing of note in 0.13 is that React Components are no longer special objects that need to be created using a specific method (createClass()). One of the benefits of this change is that you can use the es6 class syntax, but also tons of other patterns work as well!

Below are a few examples creating React components that all work as expected using a bunch of JS object creation patterns (https://github.com/getify/You-Dont-Know-JS/blob/master/this%20&%20object%20prototypes/ch4.md#mixins). All of the examples are of stateful components, and so need to delegate to React.Component for setState(), but if you have stateless components each patterns tends to get even simpler. The one major caveat with react components is that you need to assign props and context to the component instance otherwise the component will be static. The reason is

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var Globalize = require('globalize')

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.cm-s-monokai .cm-tag.cm-error,
.cm-s-monokai .cm-bracket.cm-error {
  color: #f92672;
  background: transparent;
}

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/*global CodeMirror */

function indexOf(string, pattern, from) {
  if (typeof pattern === "string") {
    var found = string.indexOf(pattern, from);
    return found;
  }
  var m = pattern.exec(from ? string.slice(from) : string);
  return m ? (m.index + from) : -1;
}

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function fetchSiteStatus(){
  //pretend this is being fetched from a server
  return {
    type: 'FETCH_SITE_STATUS'
    payload: { currentStatus: 'awesome', currentUser: 'John', lastLogin: new Date() }
  }
}

function fetchStatuses(){

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import { createStore } from 'redux';
import combineReducers from './combineReducers';

let Store = createStore(combineReducers({
  
  reducerA(state = 0, action, waitFor){
    if ( action.type === 'TEST'){
      waitState = waitFor(waitFor.reducerB)
      if ( waitState.reducerB === 5 )
        state = 10

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import React from 'react';
import { render, findDOMNode } from 'react-dom'

render(<div/>, document.getElementById('root'))

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import React from 'react';
import { Router as BaseRouter } from 'react-router';
import { getParamNames, formatPattern } from 'react-router/lib/PatternUtils';
import { createRoutes } from 'react-router/lib/RouteUtils'
import createBrowserHistory from 'history/lib/createBrowserHistory';
import useBeforeUnload from 'history/lib/useBeforeUnload';
import invariant from 'app/utils/invariant';
import { each, pick, omit, sortBy } from 'lodash';

const EMPTY_AREA = '@@none';

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import React from 'react';
import ListMovementMixin from 'react-widgets/lib/mixins/ListMovementMixin';
import List from 'react-widgets/lib/List';
import ListOption from 'react-widgets/lib/ListOption';
import { dataText } from 'react-widgets/lib/util/dataHelpers';
import cn from 'classnames';

import BaseVirtualList from 'react-list';

let VirtualList = React.createClass({

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class Tab {
 static childContextTypes = {
   registerHook: PropTypes.func
 }
 
 constructor() {
   super()
   this._hooks = []
 }