JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://cdn.sencha.io/ext-4.1.0-gpl/resources/css/ext-all.css" />
<script src="http://cdn.sencha.io/ext-4.1.0-gpl/ext-all-debug.js"></script>

JavaScript

var storeInstance = Ext.create('Ext.data.ArrayStore', {
    fields: ['company', 'price'],
    data: [
        ['3m Co',71.72],
        ['Alcoa Inc',29.01],
        ['Boeing Co.',75.43]
    ]
});

var storeConfig = {
    xtype: 'store:array',  
    fields: [ 'company', 'price' ],
    data: [
        ['3m Co',71.72],
        ['Alcoa Inc',29.01],
        ['Boeing Co.',75.43]
    ]
};

Ext.widget({
    xtype: 'combobox',
    renderTo: Ext.getBody(),
    fieldLabel: 'Store instance',
    displayField: 'company',
    valueField: 'price',
    store: storeInstance
});

Ext.widget({
    xtype: 'combobox',
    renderTo: Ext.getBody(),
    fieldLabel: 'Store config',
    displayField: 'company',
    valueField: 'price',
    store: storeConfig
});