1 What it is What output shows you
2 when you write |console.log(typeof(variable);
3Undefined: "undefined"
4Null: "object"
5Boolean: "boolean"
6Number: "number"
7String: "string"
8Function object: "function"
9E4X XML object: "xml"
10E4X XMLList object: "xml"
11NodeList "Nodelist [more data]"
12HTMLCollection "HTMLCollection(1) [more data]"
13