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Discussion on: 💡 How to check if a variable is undefined in JS

estevanjantsk profile image
Estevan Jantsk

I'm wondering why would you add a variable inside an if if you didn't at least declared or received that variable as a parameter.

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Benjamin Mock Author

It might be because you don't know if a variable is declared or not. e.g. You have a global window object in the browser, but not in Node.js