lukaszewczak

Better local require() paths for Node.js

Problem

When the directory structure of your Node.js application (not library!) has some depth, you end up with a lot of annoying relative paths in your require calls like:

var Article = require('../../../models/article');

Those suck for maintenance and they're ugly.

Possible solutions

lukaszewczak

# SSL self signed localhost for rails start to finish, no red warnings. 

# 1) Create your private key (any password will do, we remove it below)

$ openssl genrsa -des3 -out server.orig.key 2048


# 2) Remove the password

$ openssl rsa -in server.orig.key -out server.key

lukaszewczak

#!/bin/bash

apt-get install mc htop git unzip wget curl -y

echo
echo "====================================================="
echo "                     WELCOME"
echo "====================================================="
echo
echo "Hub"

lukaszewczak

From my Pluralsight course: https://app.pluralsight.com/library/courses/asynchronous-javascript-reasoning/table-of-contents

• Weather http://plnkr.co/edit/ZOAaSdtnfvR6WwiuVZ6s
• Avoid Blocking – Red Background http://plnkr.co/edit/z29VyH5BPvC4oc40EyOu
• setTimeout Pyramid Challenge http://plnkr.co/edit/DGiHFQOQfnipCcpex2RH
• Drag and Drop Red Box http://plnkr.co/edit/SmSpPS5ZgPvkgn8RE6y1
• Timer onReady http://plnkr.co/edit/gafgKCrxnDIJ6YaG9Jpx
• Timer measure http://plnkr.co/edit/kPOgzEuIvUmN4o6Jenem
• Progress Number Crunching - Web Worker https://plnkr.co/edit/Yy7BOZU9sIa8EyrxJwGH
• Event Listeners Are Synchronous http://plnkr.co/edit/mDvSHpF3HcTjtvltGmQn

lukaszewczak

Node.js core does its best to treat every platform equally. Even if most Node developers use OS X day to day, some use Windows, and most everyone deploys to Linux or Solaris. So it's important to keep your code portable between platforms, whether you're writing a library or an application.

Predictably, most cross-platform issues come from Windows. Things just work differently there! But if you're careful, and follow some simple best practices, your code can run just as well on Windows systems.

Paths and URLs

On Windows, paths are constructed with backslashes instead of forward slashes. So if you do your directory manipulation

lukaszewczak

# Assuming an Ubuntu Docker image
$ docker run -it <image> /bin/bash

lukaszewczak

Free disk space when /boot is full (Ubuntu)

TL;DR

dpkg -l linux-image*
uname -r
sudo apt-get remove linux-image-2.6.32-{21,37,38,39,40,41,42,43,44}-server
sudo apt-get autoremove

lukaszewczak

'use strict';

angular.module('guiApp')
  .service('Websocket', function Websocket($q, $rootScope, PubSub) {

    var Service = {}; // Object to return for the service
    var callbacks = {}; // Keep all pending requests here until they get responses
    var currentCallbackId = 0; // Create a unique callback ID to map requests to responses
    var ws = null; // Initialize our websocket variable
    var connectStatus = false; // Is the websocket connected?

lukaszewczak

Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

lukaszewczak

const { assert } = require('chai');

function isError(e) {
    if (typeof e === 'string') {
        return Promise.reject(new Error(e));
    }
    return Promise.resolve(e);
}