I have a function which I have written which basically looks like this:

function getNextCard(searchTerms) {

  // Setup Some Variables



  // Do a bunch of logic to pick the next card based on termed passed through what I'll call here as 'searchTerms' all of this logic is omitted because it's not important for my question.

  // ...



  // If we find a next card to give, than give it

  if (nextCardFound)

    return nextCardFound;



  // Otherwise - I'm returning undefined

  return undefined;

}

Question: Would it be better to return null here?

I can pass whatever I want back - obviously... I just wasn't sure what is the best thing to use.

The code that calls this function knows how to deal with undefined (it actually won't ever really happen unless something goes horribly wrong)

The reason I'm asking this question is that I heard somewhere something that sounded like Don't assign undefined to variables or something - that it will make it harder to debug. So, the fact that I can see that null gets passed back tells me that the return is working - but basically function similar to undefined.

Documentation:

Mozilla Docs Didn't answer my question... google didn't either :

This SO Question - was way too broad for what I'm trying to figure out here.