JavaScript’s typeof operator should be ignored. It’s broken.
A more reliable test for data types:
Object.prototype.toString.call(data);
For example:
Object.prototype.toString.call([]); // [object Array]
Object.prototype.toString.call({}); // [object Object]
Object.prototype.toString.call(”); // [object String]
Object.prototype.toString.call(new Date()); // [object Date]
Object.prototype.toString.call(1); // [object Number]
Object.prototype.toString.call(function () {}); // [object Function]
Object.prototype.toString.call(/test/i); // [object RegExp]
Object.prototype.toString.call(true); // [object Boolean]
Object.prototype.toString.call(null); // [object Null]
Object.prototype.toString.call(); // [object Undefined]
John Hardy Developer 