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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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AudreyD.Dev

<p>That’s not a “hidden cost”, that’s just how the array data structure works. Item lookup is O(n) in arrays but is O(1) in hashmaps.</p>
