<i>// constructor that provides mapping <b>for</b> reading the record data objects</i>
<a href="output/Ext.data.DataReader.html#Ext.data.DataReader-fields" ext:member="fields" ext:cls="Ext.data.DataReader">fields</a>: [
<i>// map Record's <em>'firstname'</em> field to data object's key of same name</i>
<i>// constructor that provides mapping <b>for</b> reading the record data objects</i>
<a href="output/Ext.data.DataReader.html#Ext.data.DataReader-fields" ext:member="fields" ext:cls="Ext.data.DataReader">fields</a>: [
<i>// map Record's <em>'firstname'</em> field to data object's key of same name</i>