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What is the difference between shallow copy and deep copy?

A shallow copy duplicates only the top-level properties, while a deep copy recursively copies all nested objects and arrays.

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What are JavaScript Closures and how are they useful in practice?

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1 . What is the difference between let, const, and var?

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JB

Jeevan Bhargav

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This answer is calibrated for technical interviews. Verify benchmarks in local sandboxes before deploying.