GitHub - tc39/proposal-signals: A proposal to add signals to JavaScript.
Stage 1 (explanation) TC39 proposal champions: Daniel Ehrenberg, Yehuda Katz, Jatin Ramanathan, Shay Lewis, Kristen Hewell Garrett, Dominic Gannaway, Preston Sego, Milo M, Rob Eisenberg Original authors: Rob Eisenberg and Daniel Ehrenberg This document describes an early common direction for signals in JavaScript, similar to the Promises/A+ effort which preceded the Promises standardized by TC39 i
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ã“ã®è¨˜äº‹ã§ã®using宣言ã®å‹•ä½œã¯Babelã®transformåŠã³es-shimsã®polyfill実装ã«ä¾å˜ã—ã¦ãŠã‚Šã€å®Ÿéš›ã®V8エンジンやTypeScriptã®ãƒˆãƒ©ãƒ³ã‚¹ãƒ‘イル出力ã®æŒ™å‹•ã¨ã¯ç•°ãªã‚‹å¯èƒ½æ€§ãŒã‚ã‚Šã¾ã™ã€‚ 以下ã®æŒ™å‹•ãŒusing宣言ã«å¯¾å¿œã—ã¦ã„る処ç†ç³»ã®å®Ÿéš›ã®æŒ™å‹•ã¨ç•°ãªã‚‹å ´åˆã¯ã‚³ãƒ¡ãƒ³ãƒˆã‚’ã„ãŸã ã‘ã‚‹ã¨å¹¸ã„ã§ã™ã€‚ å°Žå…¥ 先日ã€Twitterã§ã“ã‚“ãªãƒ„イートãŒå›žã£ã¦ãã¾ã—ãŸã€‚ TypeScript 5.2ã§æ–°ã—ã„「using宣言ã€ãŒè¿½åŠ ã•ã‚Œã‚‹ã¨ã„ã†ã‚‚ã®ã§ã™ã€‚ ã—ã‹ã‚‚ã€TypeScriptã®ç‹¬è‡ªæ§‹æ–‡ã‹ã¨æ€ã„ãã‚„ã€JavaScriptã®Stage 3ã®Proposalã‚’TypeScriptã§å…ˆè¡Œå®Ÿè£…ã™ã‚‹ã¨ã„ã†é€šå¸¸ã®TypeScriptã®å®Ÿè£…プãƒã‚»ã‚¹ã«å‰‡ã£ãŸã‚‚ã®ã§ã—ãŸã€‚ æ–°ã—ã„変数宣言ã®è¿½åŠ ã¯ES 2015(ES6)ã®ã€Œletã€ã€Œconstã€ä»¥æ¥ã§ãªã‚“ã¨8å¹´ã¶ã‚Šã§ã€JavaScript/T
ES2023 features list
ES2023 Features! Array find from last Hashbang Grammar Symbols as WeakMap keys Change array by copy Array find from last Array.prototype.findLast and Array.prototype.findLastIndex 📕 let nums = [5,4,3,2,1]; let lastEven = nums.findLast((num) => num % 2 === 0); // 2 let lastEvenIndex = nums.findLastIndex((num) => num % 2 === 0); // 3Hashbang Grammar #! for JS 📕 The first line of this script begins
ECMAScript 2025 feature: Set methods
In this blog post, we examine the ECMAScript proposal “Set methods for JavaScript†by Michał Wadas, Sathya Gunasekara and Kevin Gibbons. It introduces new methods for Sets. New Set methods that return Sets  # Set.prototype.union(other)  # This method returns a Set that is the union of this and other. Type signature: Set<T>.prototype.union(other: SetReadOperations<T>): Set<T> The type of other, Set
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ç†è€…ã¯æ¬¡ã® 2 ã¤ã® ECMAScript ã®ãƒ—ãƒãƒãƒ¼ã‚¶ãƒ«ã«æ³¨ç›®ã—ã¦ã„ã¾ã™ã€‚ Module Expressions Module Declarations ã“ã® 2 ã®ãƒ—ãƒãƒãƒ¼ã‚¶ãƒ«ã¯æ§‹æ–‡ã®ã¿ã«æ³¨ç›®ã™ã‚‹ã¨ã‚ˆãä¼¼ã¦ã„ã¾ã™ã€‚ã—ã‹ã—ãã®ãƒ¢ãƒãƒ™ãƒ¼ã‚·ãƒ§ãƒ³ã¯å…¨ãç•°ãªã‚Šã¾ã™ã€‚ ã“ã®ãƒ—ãƒãƒãƒ¼ã‚¶ãƒ«ãŒç™»å ´ã—ãŸã®ã¯ 2 å¹´ã»ã©å‰ã§ã™ãŒã€ç¾åœ¨ã§ã‚‚仕様ã®ç–定ãŒé€²ã‚“ã§ã„ã¾ã™ã€‚ã“れらã®ãƒ—ãƒãƒãƒ¼ã‚¶ãƒ«ãŒé †èª¿ã«é€²æ—ã— ECMAScript ã«å–ã‚Šè¾¼ã¾ã‚Œã‚‹ã“ã¨ã«å‚™ãˆã¦ã€ãれらã®ãƒ¢ãƒãƒ™ãƒ¼ã‚·ãƒ§ãƒ³ã‚’今ã®ã†ã¡ã«æ•´ç†ã—ã¦ãŠãã¾ã—ょã†ã€‚ ã¾ãš Module Expressions ã‚‚ Module Declarations ã‚‚ã€ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã®ä¸ã§æ–°ã—ã„モジュールを作æˆã™ã‚‹æ§‹æ–‡ã‚’å°Žå…¥ã™ã‚‹ãƒ—ãƒãƒãƒ¼ã‚¶ãƒ«ã§ã™ï¼ˆåå‰ã‹ã‚‰æƒ³åƒã§ãã‚‹ã¨ãŠã‚Šï¼‰ã€‚ // Module Expressions ã®ä¾‹ const mod1 = module { export co
ECMAScript proposal: iterator helpers
Update 2022-12-15: New section “How will this proposal affect future JavaScript APIs?†In this blog post, we look at the ECMAScript proposal “Iterator helpers†by Gus Caplan, Michael Ficarra, Adam Vandolder, Jason Orendorff, Kevin Gibbons, and Yulia Startsev. It introduces utility methods for working with iterable data: .map(), .filter(), .take(), etc. The style of the proposed API clashes with th
Record & Tuples ã‹ã‚‰æ´¾ç”Ÿã—㟠JSON.parseImmutable ã¨ã„ã†ãƒ—ãƒãƒãƒ¼ã‚¶ãƒ«ãŒã‚ˆã•ãã†
Records & Tuples ã¨ã„ã†ãã“ãã“有å(?)ãªãƒ—ãƒãƒãƒ¼ã‚¶ãƒ«ãŒã‚ã‚Šã¾ã™ãŒã€ãã®ãƒ—ãƒãƒãƒ¼ã‚¶ãƒ«ã‹ã‚‰æ´¾ç”Ÿã—㟠JSON.parseImmutable ã¨ã„ã†æ–°ã—ã„プãƒãƒãƒ¼ã‚¶ãƒ«ãŒè‰¯ã•ãã†ãªã®ã§ç´¹ä»‹ã—ã¾ã™ã€‚ Records & Tuples Records & Tuples ã¯ãƒ¬ã‚³ãƒ¼ãƒ‰ã¨ã‚¿ãƒ—ルã¨ã„ã†æ–°ã—ã„ãƒ‡ãƒ¼ã‚¿æ§‹é€ ã‚’å°Žå…¥ã™ã‚‹ç¾åœ¨ Stage 2 ã®ãƒ—ãƒãƒãƒ¼ã‚¶ãƒ«ã§ã™ã€‚ レコードã¨ã‚¿ãƒ—ルã¯ã€ãã‚Œãžã‚Œã‚¤ãƒŸãƒ¥ãƒ¼ã‚¿ãƒ–ルãªã‚ªãƒ–ジェクトã¨é…列ã®ã‚ˆã†ãªã‚‚ã®ã§ã™ã€‚ç¾åœ¨æ案ã•ã‚Œã¦ã„る構文ã§ã¯é€šå¸¸ã®ã‚ªãƒ–ジェクトリテラルやé…列リテラルã®é ã« # ã‚’ã¤ã‘ã‚‹ã¨ã€ãƒ¬ã‚³ãƒ¼ãƒ‰ã¨ã‚¿ãƒ—ルã«ãªã‚Šã¾ã™ã€‚ const record = #{ x: 1, y: 2, }; const tuple = #[1, 2, 3]; レコードやタプルやイミュータブルãªãƒ‡ãƒ¼ã‚¿æ§‹é€ ãªã®ã§å¾Œã‹ã‚‰å†…容を更新ã™ã‚‹ã“ã¨ã¯ã§ãã¾ã›ã‚“。 レコードã¨ã‚¿ãƒ—ルã®å¤§
ECMAScript proposal: `Array.fromAsync()`
This blog post is about the ECMAScript proposal “Array.fromAsync for JavaScriptâ€Â by J. S. Choi. It introduces a static method for converting asynchronous iterables to Arrays. Tools for working with synchronous iterables  # Currently JavaScript provides several tools for working with synchronous iterables – for example: function* createSyncIterable() { yield 'a'; yield 'b'; yield 'c'; } // Array-de
ECMAScript proposal: RegExp flag `/v` makes character classes and character class escapes more powerful
ECMAScript proposal: RegExp flag /v makes character classes and character class escapes more powerful In this blog post, we look at the ECMAScript proposal “RegExp v flag with set notation + properties of strings†by Markus Scherer and Mathias Bynens. The new flag /v  # The proposed new regular expression flag /v (.unicodeSets) enables three features: Support for multi-code-point graphemes (such a
ECMAScript proposal “Change Array by copyâ€: four new non-destructive Array methods
ECMAScript proposal “Change Array by copyâ€: four new non-destructive Array methods This blog post describes the ECMAScript proposal “Change Array by copy†by Robin Ricard and Ashley Claymore. It proposes four new methods for Arrays and Typed Arrays: .toReversed() .toSorted() .toSpliced() .with() The new methods are for Arrays and TypedArrays  # This blog post only demonstrates the new methods with
ECMAScript proposal: searching Arrays from end to start via `.findLast()` and `.findLastIndex()`
ECMAScript proposal: searching Arrays from end to start via .findLast() and .findLastIndex() This blog post describes the ECMAScript proposal “Array find from last†by Wenlu Wang and Daniel Rosenwasser. Topic of this blog post: methods of Arrays and of Typed Arrays  # In this blog post, we explore methods of Arrays. But everything we learn also applies to Typed Arrays. Searching Arrays  # The foll
ES2022 feature: class static initialization blocks
The ECMAScript proposal “Class static initialization blocks†by Ron Buckton is at stage 4 and scheduled to be included in ECMAScript 2022. For setting up an instance of a class, we have two constructs in JavaScript: Field: Create (and optionally initialize) instance properties. Constructor: A block of code that is executed before setup is finished. For setting up the static part of a class, we onl
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GitHub - tc39/faq
GitHub - tc39/proposal-optional-chaining-assignment: `a?.b = c` proposal
GitHub - tc39/proposal-promise-with-resolvers
ECMAScript proposal: source text access for `JSON.parse()` and `JSON.stringify()`
GitHub - tc39/proposals: Tracking ECMAScript Proposals
GitHub - daumann/ECMAScript-new-features-list: A comprehensive list of new ES features, including ES2015 (ES6), ES2016, ES2017, ES2018, ES2019
GitHub - tc39/proposal-explicit-resource-management: ECMAScript Explicit Resource Management
What's new in ES2022? | Yagmur Cetin Tas
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