Tencent IMWeb Frontend Team
Mar 15, 2021 · Frontend Development
Why Object.keys() Doesn’t Preserve Insertion Order: A Deep Dive into JavaScript Engine Sorting
This article investigates why JavaScript's Object.keys() may return keys in an unexpected order, explains the specification‑defined sorting rules for integer and string properties, demonstrates the issue with timestamp tags on iOS and Android, and explores the actual implementations in QuickJS and V8 engines.
JavaScriptObject.keysQuickJS
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