JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://documentcloud.github.com/underscore/underscore-min.js"></script>

JavaScript

$().ready(function () {
    "use strict";

    var testFunc,
        $i = 0;

    testFunc = function (stringo) {
        $i++;
        console.log($i, arguments);
        return stringo;
    };
    testFunc = _.memoize(testFunc);

    testFunc('test');
    console.log($i);
    testFunc('test');
    console.log($i);
    testFunc('test');
    console.log($i);
    testFunc('test');
    console.log($i);
});