~/talk

A Deep Dive into ECMAScript 2023 Features

Talkat XtremeJS 2023 · on Tuesday, 2023-11-21· [javascript, compilers-and-language-design]

speaker

name:Dmitrii Ivashchenko

website:https://bit.ly/dmitry_ivashenko

resources

video:https://youtu.be/HmJquUPtuI0

slides:none on file

summary

Adds concrete APIs and examples: findLast/findLastIndex returns 9 for [2,4,7,6,9] and returns index 3 for the last "test" occurrence, change‑by‑copy gives non‑mutating methods like toReversed/toSorted/toSpliced/with so arrays return new copies, Atomics.waitAsync provides a promise‑based wait that resolves with outcomes like "ok" or "timed out", WeakMap accepts Symbol keys, string.isWellFormed and toWellFormed fix surrogate pairs, resizable ArrayBuffer supports maxLength and resize, array.groupBy/map.groupBy and Promise.withResolvers and ArrayBuffer.prototype.transfer enable safer grouping, external resolution, and ownership transfer.

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