1
There's Math.random(), and then there's Math.random()
V8’s Math.random implementation now uses an algorithm called xorshift128+, improving the randomness compared to the old MWC1616 implementation.
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2
Optimizing hash tables: hiding the hash code
Several JavaScript data structures such as Map, Set, WeakSet, and WeakMap use hash tables under the hood. This article explains how V8 v6.3 improves hash table performance.