detect object type in javascript

typeof.js

/*! copyright: sofish, https://github.com/sofish, licensed under MIT */

var util = {};

// detect object type
// note that everything is a object in javascript
util.type = function(obj) {
  var str = Object.prototype.toString.call(obj);
  return str.replace(/^\[object (\w+)\]$/, '$1');
}

// test case
util.type('String') === 'String';
util.type(['Array']) === 'Array';
util.type({type: 'Object'}) === 'Object';
util.type(1) === 'Number';
// etc.