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function toType(obj) { var systype = ({}).toString.call(obj).match(/\s([a-zA-Z]+)/)[1]; if (systype === "Object") { /** * See if this is a custom user type, a la: * function Foo() {} * foo = new Foo(); * toType(foo); // returns "Foo" * toType(Foo); // returns "Function" */ var usertype = obj.constructor.toString().match(/function (.*?)\(/)[1]; return usertype; } else { return systype; } }