Riyadh Al Nur riyadhalnur

UPDATE (March 2020, thanks @ic): I don't know the exact AMI version but yum install docker now works on the latest Amazon Linux 2. The instructions below may still be relevant depending on the vintage AMI you are using.

Amazon changed the install in Linux 2. One no-longer using 'yum' See: https://aws.amazon.com/amazon-linux-2/release-notes/

Docker CE Install

sudo amazon-linux-extras install docker
sudo service docker start

GPG and git on macOS

Setup

No need for homebrew or anything like that. Works with https://www.git-tower.com and the command line.

Install https://gpgtools.org -- I'd suggest to do a customized install and deselect GPGMail.
Create or import a key -- see below for https://keybase.io
Run gpg --list-secret-keys and look for sec, use the key ID for the next step
Configure git to use GPG -- replace the key with the one from gpg --list-secret-keys

@kangax's ES6 quiz, explained

@kangax created a new interesting quiz, this time devoted to ES6 (aka ES2015). I found this quiz very interesting and quite hard (made myself 3 mistakes on first pass).

Here we go with the explanations:

Question 1:

(function(x, f = () =&gt; x) {

#!/usr/bin/env bash

# Assuming OS X Yosemite 10.10.4

# Install XCode and command line tools
# See https://itunes.apple.com/us/app/xcode/id497799835?mt=12#
# See https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man1/xcode-select.1.html
xcode-select --install

ES6 Defaults / Overrides Pattern

Combine default parameters and destructuring for a compact version of the defaults / overrides pattern.

function foo ({
    bar = 'no',
    baz = 'works!'
  } = {}) {

	// Require and initialize outside of your main handler
	const mysql = require('serverless-mysql')({
	config: {
	database: process.env.AURORA_DB_NAME,
	user: process.env.AURORA_USERNAME,
	password: process.env.AURORA_PASSWORD,
	host: process.env.AURORA_HOST,
	port: process.env.AURORA_PORT
	}
	});

	const publicPath = 'public';
	// Node os module
	// The os module provides a number of operating system-related utility methods.
	// It can be accessed using:
	const os = require('os');
	// Using a single monolithic configuration file impacts comprehension and
	// removes any potential for reusability.
	// As the needs of your project grow, you have to figure out the means to manage
	// webpack configuration more effectively.

	language: node_js
	node_js:
	- "6"
	env:
	- CXX=g++-4.8
	addons:
	apt:
	sources:
	- ubuntu-toolchain-r-test
	packages:

	#!/bin/bash
	#
	# steps taken verbatim from:
	# http://docs.aws.amazon.com/AmazonECS/latest/developerguide/docker-basics.html#install_docker
	#
	sudo yum update -y
	sudo yum install -y docker
	sudo service docker start
	sudo usermod -a -G docker ec2-user
	# log out and log in to pickup the added group

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