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React lifecycle cheatsheet

Method	Side effects1	State updates2	Example uses
Mounting
componentWillMount		✓	Constructor equivalent for createClass
render			Create and return element(s)
componentDidMount	✓	✓	DOM manipulations, network requests, etc.
Updating
componentWillReceiveProps		✓	Update state based on changed props

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/* eslint no-useless-escape: 0 */
/* eslint max-len: 0 */
/**
 * For more info regarding metro config:
 * @see https://facebook.github.io/metro/docs/en/configuration
 */
const path = require("path");
const fs = require("fs");

// Get blacklist factory

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#!/usr/bin/env bash -e

HOST=${1:-cloudflare.com}
FILENAME=${2:-${HOST%%.*}}

# For file naming, see https://support.ssl.com/Knowledgebase/Article/View/19/0/der-vs-crt-vs-cer-vs-pem-certificates-and-how-to-convert-them
# For HTTP Public Key Pinning (HPKP), see https://developer.mozilla.org/en-US/docs/Web/HTTP/Public_Key_Pinning
CERTIFICATE_PEM="${FILENAME}_certificate.ascii.crt"
CERTIFICATE_DER="${FILENAME}_certificate.crt"
PUBKEY_PEM="${FILENAME}_pubkey.ascii.key"

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class ViewController: UIViewController {
    @IBOutlet weak var tableView: UITableView!
    @IBOutlet weak var heightTableView: NSLayoutConstraint!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        tableView.addObserver(self, forKeyPath: "contentSize", options: .new, context: nil)
    }
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)

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bash -c 'while [[ "$(curl -s -o /dev/null -w ''%{http_code}'' localhost:9000)" != "200" ]]; do sleep 5; done'

# also check https://gist.github.com/rgl/c2ba64b7e2a5a04d1eb65983995dce76

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Common Options

-#, --progress-bar Make curl display a simple progress bar instead of the more informational standard meter.

-b, --cookie <name=data> Supply cookie with request. If no =, then specifies the cookie file to use (see -c).

-c, --cookie-jar <file name> File to save response cookies to.

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Про токены, JSON Web Tokens (JWT), аутентификацию и авторизацию. Token-Based Authentication

Preconditions:

В данной заметке рассматривается работа JWT с симметичным алгоритмом шифрования (HS256/HS384/HS512)

Основы:

Аутентификация(authentication, от греч. αὐθεντικός [authentikos] – реальный, подлинный; от αὐθέντης [authentes] – автор) - это процесс проверки учётных данных пользователя (логин/пароль). Проверка подлинности пользователя путём сравнения введённого им логина/пароля с данными сохранёнными в базе данных.

Авторизация(authorization — разрешение, уполномочивание) - это проверка прав пользователя на доступ к определенным ресурсам.

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Installing Postgres via Brew

Pre-Reqs

Brew Package Manager

In your command-line run the following commands:

1. brew doctor
2. brew update

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Does anyone have a script to sync their forked #swiftlang repos with upstream? So: pull upstream github/apple/* then push origin github/me/* - @jesse_squires

Reference: Syncing a fork - User Documentation

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// define shim for node.js
(Symbol as any).asyncIterator = Symbol.asyncIterator || Symbol.for("Symbol.asyncIterator");

// helpers
function sleep(ms: number) {
    return new Promise<void>(resolve => setTimeout(resolve, ms));
}
async function returnAfter<T>(time: number, value: T) {
    await sleep(time);
    return value;