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Does V8 Implementation Guarantee O(1) Complexity for ES6 Map and Set?

Linda Hamilton

Oct 20, 2024 pm 01:52 PM

Does V8 Implementation Guarantee O(1) Complexity for ES6 Map and Set?

v8 Implementation Explores Complexity of ES6 Map and Set

Querying ES6 Map and Set data structures is often assumed to exhibit O(1) complexity, but this assumption draws skepticism due to the lack of such guarantees in the JavaScript standard. However, for the v8 implementation, this assumption holds true.

V8 employs a proprietary variant of hash tables, commonly known for their swift retrieval and lookup operations with an average time complexity of O(1). These optimized hash tables form the foundation of the Map and Set implementations in v8.

To delve deeper into the technical specifics, a reference to the Chromium code review (https://codereview.chromium.org/220293002/) is provided. Within this review, the OrderedHashTable class is meticulously crafted, inheriting its design from a meticulously constructed hash table implementation (https://wiki.mozilla.org/User:Jorend/Deterministic_hash_tables).

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