Mark Malstrom markmals

Async Operations with `useReducer` Hook

9 March, 2019

We were discussing with @erusev what we can do with async operation when using useReducer() in our application. Our app is simple and we don't want to use a state management library. All our requirements are satisfied with using one root useReducer(). The problem we are facing and don't know how to solve is async operations.

In a discussion with Dan Abramov he recommends Solution 3 but points out that things are fresh with hooks and there could be better ways of handling the problem.

Problem

Diff output of two lldb commands

Setup

Copy the contents of the last snippet (lldbinit) from the gist page, and paste into your .lldbinit file. This makes the ksdiff macro known inside lldb.
Put file ksdiff.py in ~/.lldb/
sudo pip install temp
Restart Xcode debug session

Example

(lldb) ksdiff ;

My call for Kotlin as a major frontend language

I try to push for quite a long time for first class support for WebAssembly in Kotlin because I really believe that frontend development is a domain where Kotlin can be as strong as in mobile, and because this is something that would also help to increase even more the adoption on server-side.

I truly appreciate all the work already done by Kotlin/JS and Kotlin/Native teams. The dead code elimination tool and the initial WebAssembly support in Kotlin/Native are important steps in the right direction. But I believe that Kotlin needs now to make frontend a real priority to take it to the next level.

Need for a consistent and unified web frontend strategy

The first point I would like to raise is that what Kotlin needs IMO is a consistent strategy about web frontend wich includes both Javascript and WebAssembly related efforts. I can u

	//
	// DispatchQueueScheduler.swift
	//

	import Combine
	import Foundation

	// DO NOT USE THIS IN PRODUCTION
	struct DispatchQueueScheduler: Scheduler {
	let queue: DispatchQueue

	#!/bin/bash

	TARGET="$( cd "$(dirname "$1")" ; pwd -P )/$1"
	SYSROOT="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk"
	TARGET_ARCH=x86_64
	export IPHONEOS_DEPLOYMENT_TARGET=12.2

	rm -r /tmp/bitcode2intel
	mkdir -p /tmp/bitcode2intel
	pushd /tmp/bitcode2intel

	#!/usr/bin/swift sh
	import Foundation
	import PromiseKit // @mxcl ~> 6.5
	import Swifter // @mattdonnelly == b27a89

	let swifter = Swifter(
	consumerKey: "FILL",
	consumerSecret: "ME",
	oauthToken: "IN",
	oauthTokenSecret: "https://developer.twitter.com/en/docs/basics/apps/overview.html"

	import JavaScriptCore

	extension JSContext {
	subscript(key: String) -> Any {
	get {
	return self.objectForKeyedSubscript(key) as Any
	}
	set{
	self.setObject(newValue, forKeyedSubscript: key as NSCopying & NSObjectProtocol)
	}

	.PHONY: install uninstall test set-default

	test:
	sudo apt install plymouth-x11
	sudo plymouthd ; sudo plymouth --show-splash ; for ((I=0; I<10; I++)); do sleep 1 ; sudo plymouth --update=test$I ; done ; sudo plymouth --quit

	uninstall:
	rm -rv /usr/share/plymouth/themes/first \|\| true

	install: uninstall

	<html>

	<head>
	<script>
	customElements.define("star-wars-planets", class extends HTMLElement {
	constructor() {
	super();
	this.attachShadow({ mode: "open" });
	}
	static get observedAttributes() { return ["loading", "planets"]; }

	import UIKit
	import CoreServices
	import ImageIO

	class Writer {

	let output = NSTemporaryDirectory().appending("output.heic")
	lazy var outputUrl: CFURL = {
	return URL(fileURLWithPath: output) as CFURL
	}()