sicp
sweet.js
Our great sponsors
sicp | sweet.js | |
---|---|---|
11 | 12 | |
874 | 4,580 | |
1.5% | 0.0% | |
7.8 | 0.0 | |
17 days ago | over 6 years ago | |
JavaScript | JavaScript | |
Creative Commons Attribution Share Alike 4.0 | BSD 2-clause "Simplified" License |
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sicp
- MIT SICP Book in JavaScript
- About to finish cs50, where do I go now?
- How do you design a compiler and a language?
- Structure and Interpretation of Computer Programs (JavaScript Edition)
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The book that changed my development career now has a Javascript version
So what are you waiting for! Fire up your editor, go to SICP JS and change your life!
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Structure and Interpretation of Computer Programs, the famous CS book... now in JavaScript!
https://github.com/source-academy/sicp[GitHub link](https://github.com/source-academy/sicp)
- SICP: JavaScript Edition available for pre-order
- Structure and Interpretation of Computer Programs – JavaScript Edition
- Sicpjs
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MIT Press releasing an updated version of Structure and Interpretation of Computer Programs (SICP), written in Javascript! For the people who swear by the original SICP written in Scheme what do you think of an upcoming version in JS?
Here’s the link to the GitHub has a web version: https://github.com/source-academy/sicp
sweet.js
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JavaScript Macros in Bun
I was ready to be excited from the title, but was utterly disappointed :(
IMO these aren’t macros in the Lisp-sense of the word (or Rust, or even C); yeah they run code at compile time, but that’s where the common ends.
Macros should be able to apply syntactic transformation on the code. Lisp is famous for allowing that by representing code as lists. Rust has a compiler-level API to give tokens and run arbitrary code, then spit new tokens out. C macros operate on the tokens level, so with enough magic you can transform code to the shape you want.
This… isn’t any of that.
A pretty good example (and something I’m still sad that it didn’t take off) of macros in JS is Sweet.js[0]. Babel macros[1] are a bit higher level, where macros require the input to already be a valid AST, but that’s also cool.
This… I’d say it’s more of a build-time code execution feature, not a macro feature.
[0]: https://www.sweetjs.org/
Macros I'd expect to be able to be able to expand at compile time to more code to reduce boilerplate, something like SweetJS.
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Angular Signals: What? Why? and How? (Classy explanation of what we know as writables.)
But yes, I'll tone down my appreciation for writables in this sub, I'll confine my tangents to svelte. A kind of a shame I'd love to talk about using https://www.sweetjs.org/ to make the $ autosubscription work outside of svelte, and the like. But holy off-topic Batman!
- Sweet.js - Hygienic Macros for JavaScript (Macros allow you to sweeten the syntax of JavaScript and craft the language you always wanted)
- Interesting... Macros for JavaScript?
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Pipe Operator (|>) For JavaScript
Mozilla created SweetJS over a decade ago[0]. It added hygenic macros to JS and I'm sure everyone on the TC39 committee is familiar with it.
There's a lot to like about it, but macros in such a complicated language as JS are hard to get right. They'd also potentially lead to huge fracturing in the JS ecosystem with different factions writing their own, incompatible macro-based languages.
Look at JSX for an example. It's actually a subset of a real standard (E4X -- actually implemented in Firefox for a long time), but just one relatively small syntax addition has added complexity elsewhere.
For example, `const foo = (x:T) => x` is valid Typescript for a generic arrow function, but is an error if your file is using JSX.
I like the idea of macros, but I suspect they made the right call here.
[0] https://www.sweetjs.org/
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Ultra-minimal JSON schemas with TypeScript inference
Sweetjs is unfortunately dead [0] for like 5 years now.
It also doesn't have any typescript awareness which is required to build this kind of functionality - you want to have static type introspection available in macros so you can generate code based on provided types.
[0] https://github.com/sweet-js/sweet-core/graphs/contributors
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Equivalent to macros, ifdef and enums from other programming language?
None of these are supported natively by JavaScript. Macros and ifdefs you could get with your own build step using things like sweetjs or ifdef-loader for webpack. Enums are in a similar boat with TypeScript supporting enums out of the box. But there's also a (very early) proposal to add enums natively to JavaScript as well.
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What are some reasons to use metaprogramming?
TS doesn’t have monadic do notation, which is something that I want very badly. This would be easy to add to JavaScript with Sweet.js macros, but there’s no equivalent tool for TypeScript. I expect that extending this to TypeScript would be very difficult.
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SICP: JavaScript Edition available for pre-order
> If forEach is not to be used
That source is simply incorrect. forEach is perfectly fine to use as long as you realize what is happening. It iterates an array where each thing is a function that returns a promise. Of course the results aren't what they expect.
ES5 array additions suffer from being a little too early (though later stuff wouldn't exist otherwise, so...). They are designed to deal with holey arrays (arrays with indexes missing). This is extremely uncommon today, but was decently common once upon a time. They were also created before the iterator protocol.
The real fix is to design iterator versions that can handle things like async generator functions.
> it should be deprecated and removed from the language in a timely manner.
NOTHING can be removed from the language once added. Doing that would break all the older websites that depend on it (technically, a few minor breaks happened after they tested millions of sites and couldn't find anything that was adversely affected). At best, they can block older features from newer features. For example, using class syntax or a bunch of other ES6 language structures automatically makes your code shift into "use strict" mode.
I hope they introduce a "use strict 2" variant that strips away more of the undesirable features than the current "use strict" does.
> Since Javascript is based on C syntax, it should have the preprocessor that the birthplace of C saw it fit for that language not to be without.
That pre-processor was a source of untold nightmares. Direct injection leads to bugs. If someone is going that route, full-blown macros are the only answer. There is a full-blown macro system Mozilla created a few years ago, but it's not very popular.
https://www.sweetjs.org/
There also exist some C-style pre-processors for babel too, but they should be avoided because lisp's gensym is a critical feature that they and C both lack.
What are some alternatives?
texme - Self-rendering Markdown + LaTeX documents
Zepcode - ⚗️ Zeplin extension that generates Swift snippets from colors, fonts, and layers
schnitt
ts-morph - TypeScript Compiler API wrapper for static analysis and programmatic code changes.
cl-mill - common lisp milling software
typescript-transformer-handbook - 📘 A comprehensive handbook on how to create transformers for TypeScript with code examples
sicp - Racket implementation and notes for SICP's video lectures.
medium-editor - Medium.com WYSIWYG editor clone. Uses contenteditable API to implement a rich text solution.
WolframClientForPython - Call Wolfram Language functions from Python
ace - Ace (Ajax.org Cloud9 Editor)
axios - Promise based HTTP client for the browser and node.js
CodeMirror - In-browser code editor (version 5, legacy)