Eugene Samonenko ambroseus

TCP echo server for Node.js

Usage

Make sure you have a modern-ish version of Node.js installed.
Type npx https://gist.github.com/kfox/1280c2f0ee8324067dba15300e0f2fd3
Connect to it from a client, e.g. netcat or similar: nc localhost 9000

Advanced memoization and effects in React

Memoization is a somewhat fraught topic in the React world, meaning that it's easy to go wrong with it, for example, by [making memo() do nothing][memo-pitfall] by passing in children to a component. The general advice is to avoid memoization until the profiler tells you to optimize, but not all use cases are general, and even in the general use case you can find tricky nuances.

Discussing this topic requires some groundwork about the technical terms, and I'm placing these in once place so that it's easy to skim and skip over:

Memoization means caching the output based on the input; in the case of functions, it means caching the return value based on the arguments.
Values and references are unfortunately overloaded terms that can refer to the low-level implementation details of assignments in a language like C++, for example, or to memory

I heard some points of criticism to how React deals with reactivity and it's focus on "purity". It's interesting because there are really two approaches evolving. There's a mutable + change tracking approach and there's an immutability + referential equality testing approach. It's difficult to mix and match them when you build new features on top. So that's why React has been pushing a bit harder on immutability lately to be able to build on top of it. Both have various tradeoffs but others are doing good research in other areas, so we've decided to focus on this direction and see where it leads us.

I did want to address a few points that I didn't see get enough consideration around the tradeoffs. So here's a small brain dump.

"Compiled output results in smaller apps" - E.g. Svelte apps start smaller but the compiler output is 3-4x larger per component than the equivalent VDOM approach. This is mostly due to the code that is usually shared in the VDOM "VM" needs to be inlined into each component. The tr

Everything I Know About UI Routing

Definitions

Location - The location of the application. Usually just a URL, but the location can contain multiple pieces of information that can be used by an app
1. pathname - The "file/directory" portion of the URL, like invoices/123
2. search - The stuff after ? in a URL like /assignments?showGrades=1.
3. query - A parsed version of search, usually an object but not a standard browser feature.
4. hash - The # portion of the URL. This is not available to servers in request.url so its client only. By default it means which part of the page the user should be scrolled to, but developers use it for various things.
5. state - Object associated with a location. Think of it like a hidden URL query. It's state you want to keep with a specific location, but you don't want it to be visible in the URL.

Материалы по Go (golang)

На русском языке

Мануалы и туториалы

[Введение в программирование на Go][1]
[Маленькая книга о Go][3]
[Эффективный Go][2]
Есть еще [Краткий пересказ Effective Go на русском языке][4], но 2009 года

	// Core assets
	let coreAssets = [];

	// On install, cache core assets
	self.addEventListener('install', function (event) {

	// Cache core assets
	event.waitUntil(caches.open('app').then(function (cache) {
	for (let asset of coreAssets) {
	cache.add(new Request(asset));

	<!doctype html>
	<html lang="en">
	<body>
	<script>
	const HB = "Happy Birthday"
	const name = "Cray"
	let i = 0;
	while (i < 2) {
	document.write(`${HB} to you.<br/>`)
	i++

	More recent resolution:

	1. cd ~/../../etc (go to etc folder in WSL).
	2. echo "[network]" \| sudo tee wsl.conf (Create wsl.conf file and add the first line).
	3. echo "generateResolvConf = false" \| sudo tee -a wsl.conf (Append wsl.conf the next line).
	4. wsl --terminate Debian (Terminate WSL in Windows cmd, in case is Ubuntu not Debian).
	5. cd ~/../../etc (go to etc folder in WSL).
	6. sudo rm -Rf resolv.conf (Delete the resolv.conf file).
	7. In windows cmd, ps or terminal with the vpn connected do: Get-NetIPInterface or ipconfig /all for get the dns primary and
	secondary.

	btn.addEventListener("send-btn",onSend);
	send = CAF(send);
	var prevSend = Promise.resolve();

	function onSend(evt) {
	prevSend.finally(function f(){
	prevSend = send(
	CAF.timeout(1000,"send took too long."),
	{ some: "data" }
	)

	const useApi = (apiFactory, initialState) => {
	let [state, setState] = useState(initialState);
	return useMemo(() => apiFactory({ state, setState }), [
	state,
	setState,
	apiFactory
	]);
	};

	const createStore = (apiFactory, initialState) => {