variant
Elm
variant | Elm | |
---|---|---|
5 | 198 | |
178 | 7,451 | |
- | 0.2% | |
0.0 | 5.4 | |
2 months ago | about 2 months ago | |
TypeScript | Haskell | |
Mozilla Public License 2.0 | BSD 3-clause "New" or "Revised" License |
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variant
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Building React Components Using Unions in TypeScript
Variant
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ADTs in Typescript
When working in a TS codebase I'll lean on this variant library, which works pretty well as far as simple sum types go (v3 is great but not stable yet).
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disc-union - (yet another) library for working with discriminated union types
About half-way through writing this library I discovered that Variant existed... and does a great job at doing the exact same things (and more). I might not have started if I knew about that, but I'm glad I did because it has been a great learning experience!
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ts-pattern: pattern matching library for TypeScript, with smart type inference
Oddly enough, this feature alone has been a a big draw to Rust, Haskell and functional programming in general for me... so it's nice that there's libs filling the gap for TypeScript. Here's another one I haven't gotten around to trying yet either.
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Tool to normalize types (specifically intersections)?
I had to solve this for a project of mine.
Elm
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Ludic: New framework for Python with seamless Htmx support
Elm [1] is based on a similar idea. Build your app from pure functions that return HTML tags.
[1] https://elm-lang.org/
- Learning Elm by porting a medium-sized web front end from React (2019)
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Can you make your own JavaScript by implementing ECMAScript standard?
You also wouldn't really be creating your own new programing language. You would be creating something that can run JavaScript by following JavaScript standards and syntax. You might be able to add some non-standard features of your own on top of those standards, or include your own standard library of helpers or utilities, but you can't completely make a new or alternative language and then load it in the browser (or at least not by reimplementing ECMAScript standards... you actually can make your own language that runs within any Javascript enviroment, if you provide an interpreter or compiler that transforms it into valid JS. Some people have done something like this, eg Elm: https://elm-lang.org/).
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What is the best way to present the user the results of Haskell computations?
You should at least have a look at https://elm-lang.org/ it is a pure functional language like Haskell (although with fewer fancy syntax/type classes) but it has some lovely libraries for visualisation and even with plain elm (+ elm-ui) doing string transformations can be easily done.
- Course using F#: Write your own tiny programming system(s)
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Building React Components Using Unions in TypeScript
I get it. However, the whole point of using Unions to narrow your types, ensure only a set of possible scenarios can occur, and only access data of a particular union when it’s safe to do so. That’s some of what pattern matching can provide, and 100% of what using switch statements in TypeScript with their Discriminated Unions can provide. Yes, it’s not 100% exhaustive, but TypeScript is not soundly typed, and even Elm which is still has the same issue TypeScript does: You’re running in JavaScript where anything is possible. So it’s good enough to build with and much better than what you had.
- What's the state of the Elm repo? · Issue #2308 · elm/compiler
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How to render a basic calendar UI in Elm
The beauty of a language like Elm (and other lambda-calculus / functional programming inspired languages) is that there's very little transformation involved in going from an idea to code. And that seems to have a big impact on getting things done.
- Como desenvolvi um backend web em Clojure
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Is it possible to write games like Pac-Man in a functional language?
I think the most fun and approachable way for beginners to build games with functional programming is with Elm [1].
See a few (small, demo) games built by the community in [2] .
Notice Elm has abandoned the FRP approach in favor of Model-View-Update [3].
[1] https://elm-lang.org/
What are some alternatives?
type-fest - A collection of essential TypeScript types
rescript-compiler - The compiler for ReScript.
boxed - Essential building-blocks for functional & safe TypeScript code
haskelm - Haskell to Elm translation using Template Haskell. Contains both a library and executable.
TypeScript - TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
purescript - A strongly-typed language that compiles to JavaScript
ts-pattern - 🎨 The exhaustive Pattern Matching library for TypeScript, with smart type inference.
yew - Rust / Wasm framework for creating reliable and efficient web applications
idris - A Dependently Typed Functional Programming Language
reflex - Interactive programs without callbacks or side-effects. Functional Reactive Programming (FRP) uses composable events and time-varying values to describe interactive systems as pure functions. Just like other pure functional code, functional reactive code is easier to get right on the first try, maintain, and reuse.
haskell-names - Haskell suite library for name resolution
language-thrift - Haskell parser for the Thrift IDL format.