polysemy
linear
Our great sponsors
polysemy  linear  

7  8  
1,008  190  
0.5%    
0.0  0.0  
6 days ago  about 2 months ago  
Haskell  Haskell  
BSD 3clause "New" or "Revised" License  BSD 3clause "New" or "Revised" License 
Stars  the number of stars that a project has on GitHub. Growth  month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
polysemy

Functional Declarative Design: A Comprehensive Methodology for StaticallyTyped Functional Programming Languages
Thirdly, composing arbitrary effects without losing state is really, really difficult. Things are fine when you limit yourself to State and Reader, sure, but once you start with nondeterminism you’ll discover it’s shockingly easy to produce behaviors that are baffling unless you’ve spent a preposterous amount of time thinking about this stuff. (I’ve been bitten in prod by silent statedropping bugs, and rarely have I been more flummoxed.) Consider this example, which produces silent changes in the semantics of <> depending on whether you use it inside or outside of a higherorder effect. Every single effect library (besides the stillunreleased eff) gets certain combinations of effects + nondeterminism wrong. You could make the argument that most people don’t use nondeterministic monads, but eDSLs really shine when you have access to them, as you can turn a concrete interpreter to an abstract one fairly easily.

Introduction to Doctests in Haskell
Looking for a few projects that make use of it, I found accelerate, hawk, polysemy and prettysimple, so I'll be interested to poke around in their code and see how they have things set up.

ReaderT pattern is just extensible effects
Right, I think I'll just give it a shot to see. Polysemy is nice but I'm still having trouble getting what I want out of it (which may very well be entirely a fault of my own understanding)

Where's more discussion of the designs of effect systems?
Languages such as Koka only support algebraic effects, not scoping operations such as catch and listen. The Effect Handlers in Scope paper introduces scoping operations, which lead to the Haskell libraries fusedeffects and polysemy, but they turned out to have some weird semantics. eff is her effort to fix that.
 Monthly Hask Anything (June 2021)

Structuring Code with ZIO & ZLayers
*But I'm not terribly well versed in Scala's other DI offerings. I came from Haskell and didn't find anything in Scala that clicked with me until I found ZIO. It reminded me a lot of my favorite way of writing Haskell programs (https://github.com/polysemyresearch/polysemy)—albeit with a completely different implementation.
linear

Is there an existing typeclass for differences?
That's pretty much exactly the abstraction used in the 'linear' package's Affine class, in which we find points separated by vectors.

What are the current challenges in Numerical Programming for Haskell?
Linear algebra: hmatrix again with its own array type (and linear but this is restricted to low dimensions)

Advanced programming exercises/apps recommendations to code
This is very niche, but something I've wanted to do for a while is to generate some cool physics example on the surface of a sphere with https://hackage.haskell.org/package/hamilton, and display it with https://reanimate.github.io/ (using https://hackage.haskell.org/package/linear for the projection)
 Advent of Code 2021 day 06

Monthly Hask Anything (June 2021)
See also the linear library, it contains types like data V3 a = V3 a a a with all of the useful instances.
What are some alternatives?
fusedeffects  A fast, flexible, fused effect system for Haskell
purescript  A stronglytyped language that compiles to JavaScript
nimber  Finite nimber arithmetic
nuha
Exercism  Scala Exercises  Crowdsourced code mentorship. Practice having thoughtful conversations about code.
freersimple  A friendly effect system for Haskell
movingaverages
astmonad  A library for constructing AST by using donotation
effectzoo  Comparing Haskell effect systems for ergonomics and speed
linearaccelerate  Instances to mix linear with accelerate
ghc  Mirror of the Glasgow Haskell Compiler. Please submit issues and patches to GHC's Gitlab instance (https://gitlab.haskell.org/ghc/ghc). First time contributors are encouraged to get started with the newcomers info (https://gitlab.haskell.org/ghc/ghc/wikis/contributing).
magma  magma algebraic library