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Note:

When this guide is more complete, the plan is to move it into Prepack documentation.
For now I put it out as a gist to gather initial feedback.

A Gentle Introduction to Prepack (Part 1)

If you're building JavaScript apps, you might already be familiar with some tools that compile JavaScript code to equivalent JavaScript code:

Babel lets you use newer JavaScript language features, and outputs equivalent code that targets older JavaScript engines.

Задание (Golang + PostgreSQL)

Написать сервис, который будет слушать входящие запросы по HTTP, преобразовывать их в запрос к соответствующей функции Postgres, выполнять запрос и возвращать ответ клиенту.

Дописать функции Postgres для сервиса.

/Скиллы: Golang, Postgres, regexp, строки, работа с json в Golang и Postgres/

1. Web-сервис

FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.

Effective Engineer - Notes

By Edmond Lau
Highly Recommended 👍
http://www.theeffectiveengineer.com/

What's an Effective Engineer?

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

Virtual Hosts on nginx (CSC309)

When hosting our web applications, we often have one public IP address (i.e., an IP address visible to the outside world) using which we want to host multiple web apps. For example, one may wants to host three different web apps respectively for example1.com, example2.com, and example1.com/images on the same machine using a single IP address.

How can we do that? Well, the good news is Internet browsers

	const interactionMap = new Map();

	function logInteraction(interaction) {
	const clamp = val => Math.round(val * 100) / 100; // clamp to 2 decimal places

	console.groupCollapsed(`${interaction.type} interaction`, clamp(interaction.latency));
	console.log(`total latency`, clamp(interaction.latency));
	console.log('delay:', clamp(interaction.delay));
	console.groupCollapsed(`processing time in ${Object.entries(interaction.processingTimes).length} entries:`, clamp(interaction.processingTime));
	for (const [e, t] of Object.entries(interaction.processingTimes)) {

	to check if the server works - https://webrtc.github.io/samples/src/content/peerconnection/trickle-ice

	stun:
	stun.l.google.com:19302,
	stun1.l.google.com:19302,
	stun2.l.google.com:19302,
	stun3.l.google.com:19302,
	stun4.l.google.com:19302,
	stun.ekiga.net,
	stun.ideasip.com,

	# Backup
	docker exec CONTAINER /usr/bin/mysqldump -u root --password=root DATABASE > backup.sql

	# Restore
	cat backup.sql \| docker exec -i CONTAINER /usr/bin/mysql -u root --password=root DATABASE