In particular, there are 2 special types of results that actually have no value in them.
What are null and undefined?
The null and the undefined special values have no meaning. They simply exist when there’s no answer and something has to show up for it.
Are null and undefined values the same?
The null and undefined values are not the same but I recommend that you treat them similarly.
There are very few situations in which you’ll need to separate these two concepts.
But in many cases, you should go ahead and use them interchangeably.