Q: Does V8\'s Implementation of Map and Set Ensure Constant-Time Lookup Complexity?

Exploring ES6 Map and Set Complexity in V8 Implementation

Q: Is it a valid assumption that retrieval/lookup in V8's implementation of Map and Set has O(1) complexity?

While the standard doesn't guarantee such complexity, V8's implementation indeed provides O(1) lookup performance.

A: Yes, O(1) lookup is a fair assumption in V8.

V8 employs a special data structure known as a hash table variant that generally maintains O(1) complexity for lookup operations. This hash table implementation is based on "OrderedHashTable," which itself is inspired by the "Deterministic hash tables" technique.

For further technical details, you may refer to the Chromium code review linked in the original answer. This review provides insights into V8's implementation of the OrderedHashTable, which is part of its broader hash table optimizations.

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