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Elements Kinds
Elements Kinds: V8 엔진의 배열 내부 분류 방식
Why it matters
V8 internally classifies JavaScript arrays into element kinds (SMI, DOUBLE, GENERIC) to optimize execution, and this classification irreversibly degrades when types are mixed. Arrays can also be PACKED (fast) or HOLEY (slow) depending on whether gaps exist. Keeping arrays homogeneous and gap-free is critical for V8 performance.
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V8Elements KindsJavaScript ArraysSMIPACKED vs HOLEY