I have an algebraic data type for an AST, which takes a type parameter for the type of expression that the AST holds. I’m writing a function which walks the AST, transforming certain nodes, but always keeping the types of the nodes the same. For example, I can provide this function a function for transforming identifiers (like for renaming them), but the transformer has to return another identifier. The outer structure of the AST stays the same. This is important because I only want to specify transformation functions for the “interesting” cases, and allow the majority of cases to use a default transformer which does nothing more than traverse down the node’s children.

What would you name such a thing? I wouldn’t call it “map” because it doesn’t change the type parameter. It’s not “fold” because it doesn’t have the ability to vary the return type at all. It might be a special case of some other morphism, which would be helpful, but I’m not seeing it.

#FunctionalProgramming #haskell #purescript

I want to be your next #FediHire !

I've been a programmer since 1985 (as a child), I've been an IT professional since 1995 (pulling wires and swapping cards and configuring MS Windows). I graduated from University of Arkansas Fayetteville with a BS in CS in December of 2003. A full resume is available.

I am currently splitting my time between Fayetteville, Arkansas and Cove, Arkansas but I am open to relocation for the right position. My last two positions were 100% remote so I work well on asynchronous teams.

I prefer something where I can be a high-performing individual contributor: reading, writing and improving source text the majority of my day, with some time spent knowledge-sharing with other developers -- learning and teaching. I'd like to work with #Haskell, #Purescript, or #Idris as the primary source language, but I can be productive in almost any language (no PHP, please; I promised myself never again).

I would prefer W-2 employment with a base salary of at least 130k USD/yr, plus some sort of retirement offering (401k or similar) and healthcare benefits (HDCP + HSA or similar). But, I will certainly give due consideration to other compensation packages.

(Boosts appreciated.)

If you haven't heard, the #purescript build tool #spago recently has a major 1.x release.

In celebration of this I wanted to reaffirm my financial support of the project, since I don't have time/skill to contribute labor.

I *thought* I was supporting the project on liberapay, but I could find it on my giving page.

EDIT: https://opencollective.com/purescript

純粋関数型言語ではconsole.log("Hello")をlog "Hello"と書くし、foo = 42をwrite 42 fooと書く
https://qiita.com/hiruberuto/items/4d8a4739cd738c425ee2?utm_campaign=popular_items&utm_medium=feed&utm_source=popular_items

#qiita #JavaScript #Haskell #purescript

Until #UnisonLang takes over, #Nix is amazing.

I just converted my non-deterministic build system from ‘cabal build’ and ‘spago build’ to ‘nix build ‘in like three hours. Now, I can deploy this anywhere as a self-contained VM. I’m still brainstorming the ramifications of this.

Thanks to #pursnix and #IOG #IOHK #HaskellNix

#Haskell #Purescript #Deku #Hyrule #FRP #postgres

https://github.com/harryprayiv/cheeblr/commit/2dda5b2939914ea97ca1878b96c1db48a706ba49