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Discussion on: Null vs Undefined in JavaScript in 1 min

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savagepixie profile image
SavagePixie • Edited on

You make the statement "If the value is unknown at the time of variable definition, it's always best to use null," but you don't defend it. I think your point would be greatly improved if you explained why null is better than undefined (and so help other people better understand the concept.)

(Edit: unless I have somehow missed it in the article, of course)

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bgopikrishna profile image
Gopi Krishna Author

I thought the example explains that. When variables are declared but not initialized, Javascript assigns undefined to it. But when we assign null, we know that it is "empty" or "nothing" and later we can assign some value to it.

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savagepixie profile image
SavagePixie

Yes, that's right. I guess that what I'm trying to understand is more along the lines of why is it bad for your code to have a variable set as undefined? (ie, what sorts of problems does it cause?) and how does setting it to null instead fix or improve it?

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bgopikrishna profile image
Gopi Krishna Author

I don't think using null will fix or improve anything, it's just a good practice to follow.