How can I check for an empty/undefined/null string in JavaScript?

Question

I saw this question, but I didn\'t see a JavaScript specific example. Is there a simple string.Empty available in JavaScript, or is it just a case of checking f

Answer 1

var s; // undefined
var s = ""; // ""
s.length // 0

There's nothing representing an empty string in JavaScript. Do a check against either length (if you know that the var will always be a string) or against ""