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This article introduces the five major new features of ES2021, including numeric separators, String.prototype.replaceAll(), Promise.any, logical assignment operators, and WeakRefs, with detailed explanations and code examples.
The article reviews the Stage‑4 proposals slated for ES2021, explaining logical assignment operators, efficient string replacement techniques, the new Promise.any method, WeakRef usage, and readable numeric separators, each illustrated with clear JavaScript code examples.
This article introduces five new ES2021 JavaScript features—including replaceAll, Promise.any, logical assignment operators, numeric separators, and WeakRefs—explaining their behavior, usage examples, and browser support so developers can quickly adopt them.