ref: http://www.w3schools.com/jsref/jsref_operators.asp typeof "John" // Returns string typeof 3.14 // Returns number typeof NaN // Returns number typeof false // Returns boolean typeof [1, 2, 3, 4] // Returns object typeof {name:'John', age:34} // Returns object typeof new Date() // Returns object typeof function () {} // Returns function typeof myCar // Returns undefined (if myCar is not decla..