typeof

typeof.js

//Thanks to https://javascriptweblog.wordpress.com/2011/08/08/fixing-the-javascript-typeof-operator/

// typeof now
// Undefined => 		"undefined"
// Null => 				"object" 	*** fu*king mistake here ***
// Boolean => 			"boolean"
// Number => 			"number"
// String => 			"string"
// Object(uncallable) => "object"
// Array => 			"object"
// Object(callable) => 	"function"?

// what about instanceof ? jilei!!

new Date instanceof Date; //true
Math instanceof Math //TypeError


//From ES5 Object.prototype.toString returns [object [[Class]] ]

// diff with typeof
window.toType = function(obj){
	return ({}).toString.call(obj).match(/\s([a-zA-Z]+)/)[1].toLowerCase()
}

// test new function above

toType({a: 4}); //"object"
toType([1, 2, 3]); //"array"
(function() {console.log(toType(arguments))})(); //arguments
toType(new ReferenceError); //"error"
toType(new Date); //"date"
toType(/a-z/); //"regexp"
toType(Math); //"math"
toType(JSON); //"json"
toType(new Number(4)); //"number"
toType(new String("abc")); //"string"
toType(new Boolean(true)); //"boolean"