JavaScript·Intermediate·Coding·1 min read

What's a common real-world reason to write a deep-equal utility instead of relying on ===?

Short interview answer

Comparing two API response objects, or two pieces of derived state, for the same logical content rather than the same reference — for example, deciding whether to skip a re-render because the data hasn't meaningfully changed, even though a new object was created.

Key takeaway

Explain the underlying mental model clearly, then support it with a concrete example and its trade-offs.

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What's a common real-world reason to write a deep-equal utility instead of relying on ===?

Key takeaway

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