null vs undefined | variable life cycle | JavaScript Basics ( before Typescript , node js ) - 2

null vs undefined | variable life cycle | JavaScript Basics ( before Typescript , node js ) - 2

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=== vs == | Which one is better? | JavaScript Basics ( before Typescript , node js ) - 3
=== vs == | Which one is better? | JavaScript Basics ( before Typescript , node js ) - 3
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