get type of objects, errors, etc. in javascript

type.js

var type = (function (global) {
	var cache = {};
	return function (obj) {
		var key;
		return obj === null ? 'null' // null
				: obj === global ? 'global' // window in browser or global in nodejs
				: (key = typeof obj) !== 'object' ? key // basic: string, boolean, number, undefined, function
				: obj.nodeType ? 'object' // DOM element
				: cache[key = ({}).toString.call(obj)] // cached. date, regexp, error, object, array, math
				|| (cache[key] = key.slice(8, -1)); // get XXXX from [object XXXX], and cache it
	};
}(this));