promises-spec
Pipefish
promises-spec | Pipefish | |
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22 | 36 | |
1,831 | 138 | |
0.2% | - | |
0.0 | 9.2 | |
9 months ago | 13 days ago | |
Go | ||
Creative Commons Zero v1.0 Universal | MIT License |
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promises-spec
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Implement Promises/A+ from scratch
Today, I tried implementing Promises/A+ from scratch to test my coding skill. In the process, I’ve crafted this guide to share my insights and experiences with those who share a similar interest. Without further ado, let’s dive in.
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Using XPath in 2023
That made me chuckle.
For those not familiar with the promise design controversy:
http://brianmckenna.org/blog/category_theory_promisesaplus
https://github.com/promises-aplus/constructor-spec/issues/24
https://github.com/promises-aplus/promises-spec/issues/94
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Why is JavaScript so hated?
If you really want to go down the rabbit hole on this one, start here
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What the imperative shell of an Functional Core/Imperative Shell language looks like
Advantage 1, nesting, is the most important here, and it's often the most-overlooked advantage. Overlooking nesting is how Promises in Javascript got to be fundamentally broken.
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[AskJS] Is JavaScript missing some built-in methods?
Have you read the infamous GitHub thread where people tried to fix this before it got finalized? It's quite a trip
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This typo lasted several pomodoro sessions.
1.) JS implementation of Promise is not a monad. See this StackOverflow answer or this GitHub discussion for more details
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How to implement Promise in a FAANG interview
In this article, we will go over how to implement a basic version of a promise during a FAANG interview. The standard for promise implementation is called A+, but it includes a huge amount of details, making it almost impossible to implement all of them during a one-hour coding interview. Therefore, we will focus on implementing a basic variation that should be enough to show the interviewer your solving skills.
- what object
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Oopsy Poopsy ahahaha *sharts uncontrollably*
Hey, at least you weren't these guys: https://github.com/promises-aplus/promises-spec/issues/94
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Haskell is the greatest programming language of all time ... the rational adult in a room full of children ... When I program in Haskell, I am in utopia. I am in a different world than 99.9% of what I see posted on Reddit.
Total carnage
Pipefish
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Charm 0.4: a different kind of functional language
Charm is a language where Functional-Core/Imperative-Shell is the language paradigm and not just something you can choose to do in Python or Ruby or PHP or JS or your favorite lightweight dynamic language. Because of the sort of use-cases that this implies, it didn't seem suitable to write another Lisp or another ML, so I got to do some completely blank-slate design. This gives us Charm, a functional language which has no pattern-matching, no currying, no monads, no macros, no homoiconicity, nor a mathematically interesting type system — but which does have purity, referential transparency, immutability, multiple dispatch, a touch of lazy evaluation, REPL-oriented development, hotcoding, microservices … and SQL interop because everyone's going to want that.
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Charm 0.4: now with ... stability. And reasons why you should care about it.
I think it's fair to call this a language announcement because although I've been posting here about this project for a loooong time, I've finally gotten to what I'm going to call a "working prototype" as defined here. Charm has a complete core language, it has libraries and tooling, it has some new and awesome features of its own. So … welcome to Charm 0.4! Installation instructions are here. It has a language tutorial/manual/wiki, besides lots of other documentation; people who just want to dive straight in could look at the tutorial Writing an Adventure Game in Charm.
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Programming in Plain Language?
In my own language there is some syntactic flexibility but the only thing that describe pretty table could mean would be the second of the possibilities above; the first would be expressed by describe prettyTable and the third by describe PRETTY, table. This makes it more readable from the point of view of a coder, and who else is going to want to read it, my mom?
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Embedding other languages in Charm: a draft
I've been trying to think of a way of doing this which is simple and consistent and which can be extended by other people, so if someone wanted to embed e.g. Prolog in Charm they could do it without any help from me.
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Lazy Let: A Cheap Way and Easy Way to Add Lazyness
Charm does this for declaration of local constants in functions (there are no local variables in functions). So for example if you wanted to write the Collatz function this way (which you wouldn't, it's just a minimal example) then you could do so without worrying about a computational explosion:
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[OC] Median yearly salaries in the US for all programming languages with more than 200 respondents in the StackOverflow Developer Survey
I guess it's time for me to put aside my exploration of Charm and set up a collaboration with my son the lyricist.
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Global and local variables, a choice of evils
In fact that's how a lot of Charm programs end up getting written, because you want to pass a whole bundle of stuff to the functions. For example.
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What the imperative shell of an Functional Core/Imperative Shell language looks like
No, it's "shell" as in "shell of the code". The idea is that the imperative bits of the language, the bits that do the mutation of state and the IO, can can call lovely pure referentially transparent functions. But functions can't call commands (otherwise by definition they wouldn't be pure). So all your imperative-ness is reduced to about 1% of your code which lives right at the top of your call stack --- the "imperative shell" of your code. See [here](https://github.com/tim-hardcastle/Charm/blob/main/examples/adv.ch) for an example. The "imperative shell" is the main function --- all 13 lines of it --- and everything everywhere else is pure and immutable.
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What are some cool things you've built using your own language?
I'm not sure what counts as cool. It's just dogfooding at the moment. I did a bunch of other languages (only the BASIC and the Forth are up to date with the current version of the language I think), and I did a tiny adventure game (and used it as the basis for a tutorial).
- Langception VIII: Ourobouros — I wrote Forth in Charm again
What are some alternatives?
proposal-symbol-thenable
utop - Universal toplevel for OCaml
q - A promise library for JavaScript
sprig - Useful template functions for Go templates.
zx - A tool for writing better scripts
butter - A tasty language for building efficient software. WIP
proposal-set-methods - Proposal for new Set methods in JS
wyvern - The Wyvern programming language.
cats-effect - The pure asynchronous runtime for Scala
subtex - Lightweight latex-like language for authoring books
purescript - A strongly-typed language that compiles to JavaScript
Skript - Skript is a Bukkit plugin which allows server admins to customize their server easily, but without the hassle of programming a plugin or asking/paying someone to program a plugin for them.