ecma262
proposal-array-grouping
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ecma262
- TC39: Add Object.groupBy and Map.groupBy
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The "well-known" Symbols in JavaScript
These aren't valid JavaScript (@@iterator would throw an error). They are actually internal Symbols used in JavaScript. They are used to implement features like iteration, instanceOf, and such internally. They actually might get removed or changed
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📦🔓Closures in JavaScript decoded
Note that in previous editions, the ECMAScript® Language Specification used the term "lexical environment" before it decided to rename it to "Environment Record" so you might encounter this term in other definitions and tutorials.
- Document.all Willful Violation
- ES2023 Candidate source code + specification
- ES2023 candidate source code + spec
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The Evolution of JavaScript
For a new specification to be written, you need two things, a_ technical committee_, and a standard. The standard specification for JavaScript is called ECMA-262, and the technical committee is Technical Committee-39(TC39).
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Show HN: We are trying to (finally) get tail-calls into the WebAssembly standard
4. Proposed something else [ https://github.com/tc39/proposal-ptc-syntax ]
While apple is against Syntactic tail calls, they’re mainly just opposed to versions of it that would remove/unrequire the tail-call optimisation they already do: https://github.com/tc39/ecma262/issues/535
For the version of it that is backwards compatible, they wouldn’t need to do anything other than recognise it as valid syntax. Their main concern is that it "could add confusion with very little benefit."
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What happened to proper tail calls in JavaScript? (2021)
The spec for STC has a critique of PTC:
- performance
- developer tools
- Error.stack
- cross-realm tail calls
- developer intent
See: https://github.com/tc39/proposal-ptc-syntax#issues-with-ptc
Apple's 2016 response as to why they won't implement STC is here: https://github.com/tc39/ecma262/issues/535
- STC is part of the spec and will take too long to change.
- Now that they've implemented support for PTC, they don't want to regress web pages that rely on it.
- They don't want to discourage vendors from implementing PTC by agreeing to STC.
- They don't want to introduce confusion.
Some of these arguments about confusion and delays seem wrong hindsight, since on every point things would have been better if they'd just agreed to the compromise of STC.
- It would have been part of the spec years ago
- STC would have had a clear way for web pages to know when tail calls could be relied on (and PTC would have been optional)
- Other vendors didn't implement PTC in any case, despite no agreement on STC
- There's even more confusion as things are now
proposal-array-grouping
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TC39: Add Object.groupBy and Map.groupBy
Global iterator type is coming: https://github.com/tc39/proposal-iterator-helpers
But a method named `groupBy` on iterators traditionally means a different thing: https://github.com/tc39/proposal-array-grouping/issues/51#is...
Global iterable type it's too late for, since there's many extant iterables in the language and on the web which don't have it in their prototype chain and can't reasonably be changed.
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What's New in Node.js 21
Array grouping to combine like data into groups using Object.groupBy() and Map.groupBy().
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Updates from the 97th TC39 meeting
Array Grouping: A proposal to make grouping of array items easier.
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Snap.js - A competitor to Lodash
They are coming out with array.group() soon, which is supposed to also fulfil the use-case of partitioning :) - https://github.com/tc39/proposal-array-grouping.
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[AskJS] Is JavaScript missing some built-in methods?
https://github.com/tc39/proposal-array-grouping for those curious
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Set methods proposal reaches stage 3
I'm also looking forward to map.emplace() and arr.group() and iterator helpers.
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SmooshGate
At the end of the day, it comes down to whether browser vendors are willing to ship the feature even though it breaks said websites, and they do have visitor data to back those decisions. If the rule was "never break any website ever", you'd be able to block proposals you don't personally like by crafting a website that "gets broken" by that proposal.
At least in the array grouping proposal, they did evaluate amount and popularity of possibly breaking sites, before eventually renaming the method from .groupBy to .group
https://github.com/tc39/proposal-array-grouping/issues/37
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New ECMAScript 23 array features
The proposal is described here.
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how can I split an array into multiple arrays based on a property?
Remarkably, this is now a TC39 proposal.
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Upcoming ECMAScript features I'm excited about
Proposal, Polyfill
What are some alternatives?
proposal-pattern-matching - Pattern matching syntax for ECMAScript
es1995 - ES1995 – The Missing JS Polyfill
spec - WebAssembly specification, reference interpreter, and test suite.
proposal-regexp-r-escape - Regular Expression `\R` Escape for ECMAScript
proposal-ptc-syntax - Discussion and specification for an explicit syntactic opt-in for Tail Calls.
retro-random-number
TypeScript - TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
proposal-function-pipe-flow - A proposal to standardize helper functions for serial function application and function composition.
io-ts - Runtime type system for IO decoding/encoding
proposals - ✍️ Tracking the status of Babel's implementation of TC39 proposals (may be out of date)
uwm-masters-thesis - My thesis for my Master's in Computer Science degree from the University of Wisconsin - Milwaukee.
proposal-string-cooked - ECMAScript proposal for String.cooked built-in template tag