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

Also, in case you consider a whitespace filled string as "empty".

You can test it with this regular expression:

!/\S/.test(string); // Returns true if blank.