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var Type = {};
for(var i=0,type;type=['String','Array','Number'][i++];){
	(function(type){
		Type['is'+type]=function(obj){
			return Object.prototype.toString.call(obj)=='[object'+type+']';
		};
	})(type);
}
console.log(Type.isArray([]));
console.log(Type.isString("str"));