The source code

    /**
     * @class Ext.data.ArrayStore
     * @extends Ext.data.Store
     * <p>Formerly known as "SimpleStore".</p>
     * <p>Small helper class to make creating {@link Ext.data.Store}s from Array data easier.
     * An ArrayStore will be automatically configured with a {@link Ext.data.ArrayReader}.</p>
     * <p>A store configuration would be something like:<pre><code>
    var store = new Ext.data.ArrayStore({
        // store configs
        autoDestroy: true,
        storeId: 'myStore',
        // reader configs
        idIndex: 0,
        fields: [
           'company',
           {name: 'price', type: 'float'},
           {name: 'change', type: 'float'},
           {name: 'pctChange', type: 'float'},
           {name: 'lastChange', type: 'date', dateFormat: 'n/j h:ia'}
        ]
    });
     * </code></pre></p>
     * <p>This store is configured to consume a returned object of the form:<pre><code>
    var myData = [
        ['3m Co',71.72,0.02,0.03,'9/1 12:00am'],
        ['Alcoa Inc',29.01,0.42,1.47,'9/1 12:00am'],
        ['Boeing Co.',75.43,0.53,0.71,'9/1 12:00am'],
        ['Hewlett-Packard Co.',36.53,-0.03,-0.08,'9/1 12:00am'],
        ['Wal-Mart Stores, Inc.',45.45,0.73,1.63,'9/1 12:00am']
    ];
     * </code></pre>
     * An object literal of this form could also be used as the {@link #data} config option.</p>
     * <p><b>*Note:</b> Although not listed here, this class accepts all of the configuration options of
     * <b>{@link Ext.data.ArrayReader ArrayReader}</b>.</p>
     * @constructor
     * @param {Object} config
     * @xtype arraystore
     */
    Ext.data.ArrayStore = Ext.extend(Ext.data.Store, {
        /**
         * @cfg {Ext.data.DataReader} reader @hide
         */
        constructor: function(config){
            Ext.data.ArrayStore.superclass.constructor.call(this, Ext.apply(config, {
                reader: new Ext.data.ArrayReader(config)
            }));
        },

        loadData : function(data, append){
            if(this.expandData === true){
                var r = [];
                for(var i = 0, len = data.length; i < len; i++){
                    r[r.length] = [data[i]];
                }
                data = r;
            }
            Ext.data.ArrayStore.superclass.loadData.call(this, data, append);
        }
    });
    Ext.reg('arraystore', Ext.data.ArrayStore);

    // backwards compat
    Ext.data.SimpleStore = Ext.data.ArrayStore;
    Ext.reg('simplestore', Ext.data.SimpleStore);