ecma262
uwm-masters-thesis
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ecma262 | uwm-masters-thesis | |
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22 | 3 | |
14,730 | 5 | |
0.7% | - | |
9.0 | 10.0 | |
3 days ago | over 3 years ago | |
HTML | TeX | |
GNU General Public License v3.0 or later | - |
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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).
- Why Async/Await Is More Than Just Syntactic Sugar
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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
uwm-masters-thesis
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Show HN: We are trying to (finally) get tail-calls into the WebAssembly standard
Neat! This proposal caused me a lot of headaches, mechanizing its specification was the primary contribution of my Master's thesis a couple years ago[1]. Glad to see it finally moving forward after stalling for so long! Excellent work!
[1]: https://github.com/jacobmischka/uwm-masters-thesis/releases/...
- WebAssembly 2.0 Working Draft
What are some alternatives?
proposal-pattern-matching - Pattern matching syntax for ECMAScript
spec - WebAssembly specification, reference interpreter, and test suite.
interface-types
proposal-ptc-syntax - Discussion and specification for an explicit syntactic opt-in for Tail Calls.
meetings - WebAssembly meetings (VC or in-person), agendas, and notes
TypeScript - TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
component-model - Repository for design and specification of the Component Model
io-ts - Runtime type system for IO decoding/encoding
multi-memory - Multiple per-module memories for Wasm
telegraf - Modern Telegram Bot Framework for Node.js
reference-crdts - Simple, tiny spec-compliant reference implementations of Yjs and Automerge's list types.