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replaceall

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A comprehensive demo of features introduced in ECMAScript 2021 (ES12) with practical, runnable examples. Built in 2021–2026, this educational JavaScript project showcases ES2021 features including numeric separators, String.replaceAll(), logical assignment operators, Promise.any(), private class methods, WeakRef, and FinalizationRegistry usage.

  • Updated Mar 30, 2026
  • JavaScript

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