How to check for null or empty string in JavaScript

Question

Problem:

Hello Kodlogers,

I’ve completed the basic Java courses a few days ago and now focusing on web-based programming languages. I just started  JavaScript as my first preference. But the problem is I don’t know the attribute, function or method very well in JavaScript. Yeah! I know its foolish. Could you please shed some light on this?

Thanks for your help guys.

Answer 1

Well, it is mandatory to read and follow the documentation carefully before starting a programming language. So, please check the Documentation before go ahead further.

If you want to check whether the string is empty/null/undefined, use the following code:

let emptyStr = "";
if (!emptyStr) {
  console.log("This String is empty");
}

let nullStr = null;
if (!nullStr) {
  console.log("This String is null");
}