Javascript type checking

gistfile1.txt

// Checking types
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]

// Helper function
var getType = function (elem) {
  return Object.prototype.toString.call(elem);
};

// An example
if (getType(person) === '[object Object]') {
  person.getName();
}