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JavaScript arrays might appear efficient initially but can perform poorly with large datasets due to the nested operations. By replacing `Array.includes` with data structures like `Set`, `Map`, or indexed arrays, you can achieve constant-time lookups, significantly improving performance.

The Hidden Cost of JS Arrays

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WebCraft

<p>Arrays are fine for small datasets, but at scale, using Set/Map is definitely the better approach. That’s why we should always measure and choose the right data structure for the job.</p>
