holyjak

Various, unsorted notes from using and struggling with Pathom 3 with Fulcro.

Troubleshooting P3/F

Troubleshooting auto-generated Fulcro RAD id resolvers in Pathom 3

When something doesn’t work, I try to simplify it as much as possible. Often it starts working at some point. Then I try to find the exact point where it starts/stop working by bringing the broken and working alternatives closer together. And this is exactly what I did when my auto-generated RAD id-resolver did not return the expected data. It might be useful to know the steps along this path for any future troubleshooting.

This problem has two dimensions - the parser and the resolver. Here I move mostly along the parser dimension, while in the end I discovered the problem was with the resolver. Still, it is a valuable knowledge.

zeitstein

(ns app.application
  (:require
   [com.fulcrologic.fulcro.application :as app]
   [edn-query-language.core :as eql]
   [com.fulcrologic.fulcro.algorithms.tx-processing :as txn]
   [promesa.core :as p]
   [com.wsscode.pathom3.interface.eql :as p.eql]
   [com.wsscode.pathom3.connect.operation :as pco]
   [com.wsscode.pathom3.connect.indexes :as pci]))

jerblack

I wanted to be able to detect when Dark mode was turned on or off in my Go program so I can swap icons in my tray app, but the Apple-blessed methods all use Swift and ObjectiveC. To work around this I figured out the following:

• When dark mode is set, a property called "AppleInterfaceStyle" is set to "Dark" for the user.
• When dark mode is disabled, that property is removed.
• You can see this by running "defaults read -g AppleInterfaceStyle"

// Dark Mode On  
defaults read -g AppleInterfaceStyle  
 Dark 

wavejumper

React Native + macOS + Clojurescript

Project Catalyst

Since the recent release of Catalina, macOS has shipped with the ability to allow iOS/iPAD apps to run on macOS without any modification via a featureset known as Project Catalyst.

This is exciting, as writing React Native + Clojurescript apps as a target for the desktop is much more compelling than a pure Electron app (imo).

acutmore

A compile-time 4-Bit Virtual Machine implemented in TypeScript's type system. Capable of running a sample 'FizzBuzz' program.

Syntax emits zero JavaScript.

type RESULT = VM<
  [
    ["push", N_1],         // 1
    ["push", False],       // 2
 ["peek", _], // 3

mathiasbynens

// This object contains a string value that in contains a single quote,
// a double quote, a backtick, and a backslash.
const data = { foo: `a'b"c\`d\\e` };

// Turn the data into its JSON-stringified form.
const json = JSON.stringify(data);

// Now, we want to insert the data into a script body as a JavaScript
// string literal per https://v8.dev/blog/cost-of-javascript-2019#json,
// escaping special characters like `"` in the data.

yelouafi

Algebraic Effects in JavaScript part 1 - continuations and control transfer

This is the first post of a series about Algebraic Effects and Handlers.

There are 2 ways to approach this topic:

• Denotational: explain Algebraic Effects in terms of their meaning in mathematics/Category theory
• Operational: explain the mechanic of Algebraic Effects by showing how they operate under a chosen runtime environment

Both approaches are valuables and give different insights on the topic. However, not everyone (including me), has the prerequisites to grasp the concepts of Category theory and Abstract Algebra. On the other hand, the operational approach is accessible to a much wider audience of programmers even if it doesn't provide the full picture.

zaceno

/*
  
  Squirrel helps you work with data held in deeply nested objects
  
  It creates a mapping based on a given `path`. The mapping transforms a unary function `f`
  into a function that applies f to the given path of a given object.
  
  The path is given as a string, with each nesting level separated by a '.' 
  
  Some examples:

jmlsf

Using JavaScript Libraries from ClojureScript

Using JavaScript libraries from ClojureScript involves two distinct concerns:

1. Packaging the code and delivering it to the browser
2. Making ClojureScript code that accesses JavaScript libraries safe for advanced optimization

Right now, the only single tool that solves these probems reliably, optimally, and with minimal configuration is shadow-cljs, and so that is what I favor. In paricular, shadow-cljs lets you install npm modules using npm or yarn and uses the resulting package.json to bundle external dependencies. Below I describe why, what alternatives there are, and what solutions I disfavor at this time.

Packaging and Delivering Code

OleksiyRudenko

You may want to employ the Parcel backed boilerplate that implements the solution described below.

• Targets
• Pre-requisites
• Solution
• Enjoy

Targets