JSFiddle - React, Tailwind, and code Playground
HTML
<script src="http://underscorejs.org/underscore-min.js"></script>
JavaScript
var purposeObjects = [
{purpose: "daily"},
{purpose: "weekly"},
{purpose: "monthly"}
];
var daily = _.findWhere(purposeObjects, {purpose: 'daily'});
console.log( JSON.stringify(daily) );