How can I check if a localstorage variable is null or undefined?

Question

I have this code:

var sideBar = localStorage.getItem(\'Sidebar\');

I want to check if sideBar is defined and not null in an if statement. I am

Answer 1

If statements can be joined using &&

It is advisable to use '==='. e.g. if (sideBar === undefined && sideBar !== null)

http://www.w3schools.com/jsref/jsref_undefined.asp