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#Understanding closures, callbacks and promises

For a code newbie like myself, callbacks, closures and promises are scary JavaScript concepts.

10 months into my full-time dev career, and I would struggle to explain these words to a peer.

So I decided it was time to face my fears, and try to get my head around each concept.

Here are the notes from my initial reading. I'll continue to refine them as my understanding improves.

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{
    ...
    "autoload": {
        "psr-4": {
            "App\\": "app/",
            "Database\\Factories\\": "database/factories/",
            "Database\\Seeders\\": "database/seeders/"
        },
        "files": [
            ...

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Overview

Source: https://medium.com/@Mahmoud_Zalt/eloquent-relationships-cheat-sheet-5155498c209

	One to one (1-1)	One to many (1-n)	Poly one to many (1x-n)	Many to many (n-n)	Poly many to many (nx-n)
Number of models	2 only	2 only	3 and above	2 only	3 and above
Number of tables	2 (1/model)	2 (1/model)	3+ (1/model)	3 (1/model + pivot)	4+ (1/model + pivot)
Pivot table	-	-	-	required

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<?php

// This can be found in the Symfony\Component\HttpFoundation\Response class

const HTTP_CONTINUE = 100;
const HTTP_SWITCHING_PROTOCOLS = 101;
const HTTP_PROCESSING = 102;            // RFC2518
const HTTP_OK = 200;
const HTTP_CREATED = 201;
const HTTP_ACCEPTED = 202;

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require('./module.js')               // { a: 1 }
import module from './module.js'     // undefined
import { a } from './module.js'      // 1

require('./module2.js')              // { default: { a: 1 }, b: 2 }
import module2 from './module2.js'   // { a: 1}
import { b } from './module2.js'     // 2
 
require('./module3.js')              // { default: { a: 1 }, b: 2 }

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Typing vagrant from the command line will display a list of all available commands.

Be sure that you are in the same directory as the Vagrantfile when running these commands!

Creating a VM

• vagrant init -- Initialize Vagrant with a Vagrantfile and ./.vagrant directory, using no specified base image. Before you can do vagrant up, you'll need to specify a base image in the Vagrantfile.
• vagrant init <boxpath> -- Initialize Vagrant with a specific box. To find a box, go to the public Vagrant box catalog. When you find one you like, just replace it's name with boxpath. For example, vagrant init ubuntu/trusty64.

Starting a VM

• vagrant up -- starts vagrant environment (also provisions only on the FIRST vagrant up)

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Vagrant Cheat Sheet

add image

local

$ vagrant box add {title} {url}
$ vagrant init {title}
$ vagrant up

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#### Example SSH config file

# Host = a list of domains, IPs and personalized aliases that use this config
# entry. These alias names follow "Host" and are space delimited.
#  e.g. Host 192.168.1.1 example.com example1 myalias1
# Hostname = the IP or real hostname
#  e.g. Hostname 192.168.1.1
# User = the username
#  e.g. User jdoe
# Port = if this is a non standard port, i.e. not 22

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#!/bin/bash
#title			: replication-start.sh
#description		: This script automates the process of starting a Mysql Replication on 1 master node and N slave nodes.
#author		 	: Nicolas Di Tullio
#date			: 20160706
#version		: 0.2  
#usage			: bash mysql_replication_autostart.sh
#bash_version		: 4.3.11(1)-release
#=============================================================================

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<?php
//edit with your data
$repo_dir = '~/repository.git';
$web_root_dir = '~/project';
$post_script = '~/project/scripts/post_deploy.sh';
$onbranch = 'master';

// A simple php script for deploy using bitbucket webhook
// Remember to use the correct user:group permisions and ssh keys for apache user!!
// Dirs used here must exists on server and have owner permisions to www-data