Type check for JavaScript objects. Based on code from @jonbretman's slides from JsConf (https://speakerdeck.com/jonbretman/ask-not-what-javascript-can-do-for-you, slide 25) Fix for non-isNaN types.

typeCheck.js

var toString = Object.prototype.toString,
    regex = /\[object (.*?)\]/,
    type = function (o) {
        var match, typeMatch;

        // Special case for DOM elements
        if (o && o.nodeType === 1) {
            return 'element';
        }

        match = toString.call(o).match(regex);
        typeMatch = match[1].toLowerCase();

        // Special case for NaN
        if (typeMatch === 'number') {
            return isNaN(o) ? 'nan' : typeMatch;
        } else {
            return typeMatch;
        }
    };