VV vv12131415

Questions to ask potential employers

How long do you expect it would take me to deploy my first change? To become productive? To understand the codebase?
What's the longest tenure of a developer at this company?
How long has the top quarter of the developers been here?
What fraction of the developers have been here less than 6 months?
How long does it take to do a complete deployment?
How large are PRs? For a "big" PR, how many lines of code? How long is it open?
How often do you have major outages? What constitutes a major outage for you?
Do you have a defined process for the aftermath of an outage?

FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.

Effective Engineer - Notes

By Edmond Lau
Highly Recommended 👍
http://www.theeffectiveengineer.com/

What's an Effective Engineer?

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

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

Note: Some of these shortcuts have been remapped for my own convenience (Preferences->Keymap). These are Mac shortcuts, just use the Windows/Linux equivalent of the Cmd/Option/Ctrl/Del keys.

####Search, Go to, Navigation ####

Cmd + P - Search file

Cmd + Shift + O - Search everywhere

(I swapped the above two recently because I use Cmd + P to search for files most of the time).

Why objects (usually) use less memory than arrays in PHP

This is just a small post in response to [this tweet][tweet] by Julien Pauli (who by the way is the release manager for PHP 5.5). In the tweet he claims that objects use more memory than arrays in PHP. Even though it can be like that, it's not true in most cases. (Note: This only applies to PHP 5.4 or newer.)

The reason why it's easy to assume that objects are larger than arrays is because objects can be seen as an array of properties and a bit of additional information (like the class it belongs to). And as array + additional info > array it obviously follows that objects are larger. The thing is that in most cases PHP can optimize the array part of it away. So how does that work?

The key here is that objects usually have a predefined set of keys, whereas arrays don't:

	<?php
	function require_auth() {
	$AUTH_USER = 'admin';
	$AUTH_PASS = 'admin';
	header('Cache-Control: no-cache, must-revalidate, max-age=0');
	$has_supplied_credentials = !(empty($_SERVER['PHP_AUTH_USER']) && empty($_SERVER['PHP_AUTH_PW']));
	$is_not_authenticated = (
	!$has_supplied_credentials \|\|
	$_SERVER['PHP_AUTH_USER'] != $AUTH_USER \|\|
	$_SERVER['PHP_AUTH_PW'] != $AUTH_PASS

	"scripts": {
	"preinstall": "if [[ '$npm_config_user_agent' != 'yarn' ]]; then echo 'Use Yarn!'; exit 0; fi"
	}