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BFE.dev solution for Interview Question
164. What is the difference between `null` and `undefined` ? Which one should I use?

You can use both, but it's preferable to use null.

undefined is mainly used by the JS engine for props that have been declared but haven't assigned value.

null - it's a more specific type that developers use as a value, and usually, it's described as an empty result.

See references: null, undefined

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