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HTML
<script src="http://underscorejs.org/underscore-min.js"></script>
JavaScript
var sysPrefix = 'qln420';
var modelNamesList = [
{
qln420 : 'QLn420',
subType : 'rfid'
},
{
rz400 : 'RZ400',
subType : 'rfid'
}
];
var sysFind = _.property(sysPrefix);
console.log(sysFind(_.find(modelNamesList, sysFind)));