learnhaskell
astexplorer
learnhaskell | astexplorer | |
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7 | 43 | |
7,903 | 5,953 | |
- | - | |
0.9 | 6.0 | |
7 months ago | 11 days ago | |
Makefile | JavaScript | |
Creative Commons Zero v1.0 Universal | MIT License |
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learnhaskell
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Počeo da učim Haskell
learnhaskell
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Ask HN: What piece of code/codebase blew your mind when you saw it?
https://github.com/bitemyapp/learnhaskell/blob/master/dialog...
> a transducer is recognizing that the signature of foldl splits
> type Transducer a b = forall r. (r -> b -> r) -> (r -> a -> r)
> they compose like lenses
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Functional Education (2014)
The author maintains an opinionated path to learning Haskell[0], albeit lacking the criticism of resources that ultimately do not make it into his final recommendation.
[0] https://github.com/bitemyapp/learnhaskell
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Understanding Transducers
I find the following type signature captures the essence:
type Transducer x y = forall b. (b -> y -> b) -> (b -> x -> b)
https://github.com/bitemyapp/learnhaskell/blob/master/dialog...
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Learn You A Haskell For Great Good - To-Do Lists clean up unsafe?
There's some resources here: https://github.com/bitemyapp/learnhaskell
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Sequent Calculus in Haskell
Other than that, I'm afraid your issues are too broad to help much. If you're having trouble getting anywhere, I would recommend starting with some basic tutorial. Here are some decent ones. Haskell is not a language you can just pick up unless you have prior functional programming experience.
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Best resource to learn Haskell?
This is the best meta-guide I know of to learning Haskell: https://github.com/bitemyapp/learnhaskell
astexplorer
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Understanding Code Structure: A Beginner's Guide to Tree-sitter
You can play with your code here, and visualise ASTs for the same.
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What is an Abstract Syntax Tree in Programming?
Website
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How to create your own Eslint rule with tests, boosting the DX, and code-review
To understand this syntax, I recommend exploring AST Explorer. You will have a better view of how the AST of JavaScript works and how to correlate it with the Eslint syntaxy:
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Programming from Top to Bottom - Parsing
You can never mistake type_declaration with an identifier, otherwise the program will not work. Aside from that constraint, you are free to name them whatever you like, there is no one standard, and each parser has it own naming conventions, unless you are planning to use something like LLVM. If you are interested, you can see examples of naming in different language parsers in the AST Explorer.
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ESLint: under the hood
The rule that I want to write will be called not-allows-underscore: the idea is to abolish the use of underscores when declaring variables or functions. It's a real dummy rule, but it should be enough to see in action the concepts that we have discussed earlier. The first thing that I would do is to go to AST Explorer, write down a code that declares variables and functions (both standard and arrows one) and take a look at what type of node is the one that encodes the identifier. Doing that, I found out that the node type of my interest is Identifier, what a surprise! 🤣. In particular, the structure of the node holds the string used as identifier in the name property.
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😱 ESlint over Conventions - You have Not unlocked the power of ESlint 😱
All the information about the API, AST node names, AST Explorer, etc. you can read in the official documentation. I’m just going to show examples of how to automate the check-up of our created conventions.
- AST Exploret
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200 Web-Based, Must-Try Web Design and Development Tools
AST Viewer
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Building a JSON Parser from scratch with JS 🤯
If you want to see how the AST of popular languages looks, I recommend the AST Explorer. It supports various languages, and you can view the complete AST and navigate through the nodes. If you want to go further, you can try to copy some logic from an existing parser and implement it in your own, such as calculating an expression according to precedence order, for example: 1 + 2 * 3 (which is 7, not 9).
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Creating my own typescript compiler
https://astexplorer.net/ is a good resource/playground for understanding ASTs and transpilers.
What are some alternatives?
protoactor-dotnet - Proto Actor - Ultra fast distributed actors for Go, C# and Java/Kotlin
deno_swc - The SWC compiler for Deno.
Apollo-11 - Original Apollo 11 Guidance Computer (AGC) source code for the command and lunar modules.
gogocode - GoGoCode is a transformer for JavaScript/Typescript/HTML based on AST but providing a more intuitive API.
Quake-2 - Quake 2 GPL Source Release
vscode-language-tree - VSCode tree format support
pygments - Pygments is a generic syntax highlighter written in Python
ChakraCore - ChakraCore is an open source Javascript engine with a C API.
haskell-handbook - Best practices on how to be efficient with Haskell in production
Acorn - A small, fast, JavaScript-based JavaScript parser
learn-you-a-haskell - “Learn You a Haskell for Great Good!” by Miran Lipovača
proposal-type-annotations - ECMAScript proposal for type syntax that is erased - Stage 1