How to get rid of the undefined message on Chrome?

Question

How to get rid of the undefined message after console.log() a variable

var example = 5;
console.log(example);

output: 5
undefined

Why does it bother you that you get an extra message in the *developer console*? — UnholySheep, Nov 18 '21 at 14:35
don't type `console.log(example);` in the console, but simply `example` — Cid, Nov 18 '21 at 14:36
Right, It basically happens when nothing is returned from your execution. Just it logs the output of statements statements. — Anuj Raghuvanshi, Nov 18 '21 at 14:38
@Cid why you correct my edit? He wrong to write console, and if was that the problem? Because that's only possible problem of that simple code. — Simone Rossaini, Nov 18 '21 at 14:38
@SimoneRossaini if that would have been the problem, the error message would have been really different — Cid, Nov 18 '21 at 14:39

score 0 · Answer 1 · answered Nov 18 '21 at 14:44

You can't:

The reason the debug console outputs undefined after a function, is because you're running the function (example()) and then in the function body, there is no return statement so by default, the return statement will return undefined.

More about return statements at MDN

The reason it does, is: say you have a function called example

function example() {
  // Code here
}

Using the return statement inside the function, will return something:

function example() {
  // Code here
  return "Some string";
}

By default (with no return statement) there will be an undefined return statement.

function example() {
  // Code here
}

example(); // undefined

function example() {
  // Code here
  return true;
}

example(); // true

Also, it does not happen only on Chrome. It happens on all modern and old browsers with JavaScript enabled.

How to get rid of the undefined message on Chrome?

1 Answers1