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What is the difference between null and undefined in JavaScript? - Stack Overflow

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Do your students get confused about whether an answer is zero or undefined? Here is a visual mnemonic to help students remember the difference.

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JavaScript Check if Undefined – How to Test for Undefined in JS

Null and Undefined in Javascript. What's the difference between null and…, by Megan Lo, Webtips

javascript - How to check if a variable or object is undefined? - Stack Overflow

Trying to send form data but i'm getting req.body as undefined - 🙋 Help - Postman Community

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