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/*
For some reason, the change() event only fires when the input field loses focus.
Binding to other options ('change keypress paste focus textInput input') will 
fire the event several times, which is bad. The below code works even when 
content is pasted into the text field, and only fires once as expected.
*/
$('#search-form .term').bind('input', function(){
  console.log('this actually works');
});

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PHP7

• Ubuntu 16.04+

$ sudo add-apt-repository ppa:ondrej/php
$ sudo apt update
$ sudo apt install nginx php7.1-fpm php7.1-cli php7.1-common php7.1-json php7.1-opcache php7.1-mysql php7.1-phpdbg php7.1-mbstring php7.1-gd php7.1-imap php7.1-ldap php7.1-pgsql php7.1-pspell php7.1-recode php7.1-soap php7.1-tidy php7.1-dev php7.1-intl php7.1-curl php7.1-zip php7.1-xml php-xdebug

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/* -------------------------------------------------------------------------- */
// All Bootstrap 4 Sass Mixins [Cheat sheet]
// Updated to Bootstrap v4.1.x
// @author https://anschaef.de
// @see https://github.com/twbs/bootstrap/tree/v4-dev/scss/mixins
/* -------------------------------------------------------------------------- */

// Grid variables
$grid-columns: 12 !default;
$grid-gutter-width: 30px !default;

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Stripe

• https://stripe.com/docs
• https://stripe.com/docs/api

Creating a User

https://stripe.com/docs/api/ruby#create_customer

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1. Preparing the server

Install git

sudo apt install git-all

Generate Server's SSH public key

ssh-keygen -t rsa -b 4096 -C "deploy"
cat ~/.ssh/id_rsa.pub

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<?php

/**
 * Validates a given latitude $lat
 *
 * @param float|int|string $lat Latitude
 * @return bool `true` if $lat is valid, `false` if not
 */
function validateLatitude($lat) {
  return preg_match('/^(\+|-)?(?:90(?:(?:\.0{1,6})?)|(?:[0-9]|[1-8][0-9])(?:(?:\.[0-9]{1,6})?))$/', $lat);

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MySQL

Getting started:

• http://www.sqlteaching.com/
• https://www.codecademy.com/courses/learn-sql

Related tutorials:

• MySQL-CLI
• Analyzing Business Metrics

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/**
 * Encrypts plaintext using AES-GCM with supplied password, for decryption with aesGcmDecrypt().
 *                                                                      (c) Chris Veness MIT Licence
 *
 * @param   {String} plaintext - Plaintext to be encrypted.
 * @param   {String} password - Password to use to encrypt plaintext.
 * @returns {String} Encrypted ciphertext.
 *
 * @example
 *   const ciphertext = await aesGcmEncrypt('my secret text', 'pw');

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<?php

$codes = [
    'ab' => 'Abkhazian',
    'aa' => 'Afar',
    'af' => 'Afrikaans',
    'ak' => 'Akan',
    'sq' => 'Albanian',
    'am' => 'Amharic',
    'ar' => 'Arabic',

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PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

• -E: will describe the underlaying queries of the \ commands (cool for learning!)
• -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)