HTML5 localStorage loading user-input variable

Question

I am creating a HTML5 web app, and it uses localStorage to store its data. I would like to know how to see if a variable is set in localStorage, but I would like to have it so that the user inputs the name of the variable to retrieve.

Answer 1

function isSet(varName) {
    return localStorage.getItem(varName) === null
}

isSet('foo');