This article reviews recent TC39 proposals that have reached Stage 4 or entered Stage 1, covering resizable ArrayBuffers, RegExp.escape, joint iteration, iterator sequencing, locale extensions, negated operators, and stable formatting, and explains their impact on the upcoming ECMAScript releases.
This article reviews the latest TC39 proposals that have advanced to Stage 4—including Change Array By Copy, Intl.NumberFormat V3, and Symbol as WeakMap Keys—explains their new immutable‑array methods, international‑number formatting APIs, weak‑map key support, and also highlights proposals moving between other stages such as Async Context and ArrayBuffer transfer.
The January 29 TC39 meeting reviewed progress on dozens of ECMAScript proposals, outlining the criteria for moving from Stage 3 to Stage 4, Stage 2 to Stage 3, and Stage 1 to Stage 2, and highlighting key features such as Intl.DateTimeFormat.formatRange, JSON Modules, Private‑in, class static blocks, resizable array buffers, and new Intl APIs.
This article reviews the latest TC39 proposals advancing from Stage 3 to Stage 4—including Promise.any, AggregateError, WeakRefs, FinalizationRegistry, logical assignment operators, numeric literal separators, Intl.ListFormat, Intl.DateTimeFormat styles, iterator.item, Intl.Segmenter, Record & Tuple, JSON.parse source‑text access, await extensions, Array.prototype.unique, and resizable array buffers—explaining their goals, required thresholds, and providing concrete code examples.
