this post was submitted on 06 Jul 2023

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0 vs null vs undefined - explained with toilet paper (i.stack.imgur.com)

submitted 1 year ago by jeff@programming.dev to c/programmer_humor@programming.dev

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[–] JackbyDev@programming.dev 8 points 1 year ago

Basically JavaScript uses undefined to mean keys that don't exist. You know how sometimes when you're wondering about the semantics of "present but null" and "absent"? It's basically that. Undefined means it isn't there but things are only null if they've been set to null.

There are probably more nuances but that is the gist.