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0 vs null vs undefined - explained with toilet paper (i.stack.imgur.com)
submitted 3 years ago by to c/programmer_humor@programming.dev
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[–] 3 points 3 years ago (1 child)

Depends on the programming language. In JavaScript, it literally means that like the key or variable does not actually exist. Whereas like in C/C++, writing random bytes to random memory addresses would result in "undefined behaviour" which means basically anything could happen.

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  • [–] 2 points 3 years ago*

    In Javascript you can do let a = undefined, defining the variale a as undefined.

    A significant difference to defining it as null is that typeof null == "object", while typeof undefined == "undefined".

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