React-native global variable undefined
<p>I am pretty new to React-native so go easy on me! :)</p>

<p>I'm creating an app which uses multiple large json objects for its core data which need to be accessible and updatable across multiple components.  I have achieved this but found that data is only visible across components if I force the object to an array. i.e.</p>

<pre><code>global.a1['XX']=data.movies; // This works fine
global.a2=data.movies; // This is undefined in other components.
</code></pre>

<p>It works but I don't understand why so want to understand what's going on before building the app.</p>

<p>Thanks in advance for your help.</p>

<p>Sample code is below:</p>

<p>File: global.js</p>

<pre><code>var a1 = new Object();
var a2 = new Object();
module.exports = { a1, a2 }
</code></pre>

<p>File: select.js</p>

<pre><code>'use strict';
import React, { Component,PropTypes } from 'react';
import { Text} from 'react-native';
import * as global from './global';
class Select extends Component {
  render() { 
    console.log("a1:"+global.a1['XX'][0].title); // Ok
    console.log("a2:"+global.a2[0].title); // Fails with undefined is not an object
    return ( &lt;Text&gt;{global.a1['XX'][0].title} {global.a2[0].title}&lt;/Text&gt;);
}}
export default Select;
</code></pre>

<p>File: index.android.js</p>

<pre><code>var API_URL = 'http://api.rottentomatoes.com/api/public/v1.0/lists/movies/in_theaters.json';
var PARAMS = '?apikey=7waqfqbprs7pajbz28mqf6vz&amp;page_limit=2';
import React, { Component,PropTypes } from 'react';
import { AppRegistry,Text} from 'react-native';
import * as global from './global';
import Select from './select';

class test extends Component {
   constructor(props) {
    super(props);
    this.state = {loaded: false};
  }
  componentDidMount() {
    fetch(API_URL+PARAMS)
      .then((response) =&gt; { return response.json() })
      .then((responseData) =&gt; { return responseData; })
      .then((data) =&gt; {
        global.a1['XX']=data.movies;
        global.a2=data.movies;
        this.setState({loaded: true});
      })
      .done();
  }

  render() {
    if (!this.state.loaded) { return ( &lt;Text&gt;Loading...&lt;/Text&gt; );}
    console.log("a1:"+global.a1['XX'][0].title); // This works
    console.log("a2:"+global.a2[0].title); // This works
    return ( &lt;Text&gt;&lt;Select/&gt;&lt;/Text&gt; );
  }
}
AppRegistry.registerComponent('test', () =&gt; test);
</code></pre>