Eiven Mitchell ej-mitchell

How to fix openSSL incompatibility issues in older Ruby Versions. (<=2.3)

Homebrew

Install openssl 1.0.2 via homebrew :

brew install https://raw.githubusercontent.com/Homebrew/homebrew-core/64555220bfbf4a25598523c2e4d3a232560eaad7/Formula/openssl.rb -f

This should install openssl in /usr/local/opt/openssl

If you already have 1.1 installed, you should have 2 versions of opensll in: /user/local/opt/

Elm Types Glossary

There's a lot of type terminology and jargon going around when discussing types in Elm. This glossary attempts to list some of the most common type terms along with synonyms, terms from other language communities, examples, and links to more detailed articles on each topic.

Custom Type
Constructor
Unit Type

ActionCable with React

This is mainly an annotation of the Rails ActionCable documentation, with additional information for using it with React and publishing to Heroku.

Setup

Most of the boilerplate files can be generated with e.g. rails g channel Game to create a channel named GameChannel.

The generator will create a subscription file in e.g. app/assets/javascripts/subscriptions/game.coffee that contains the code to create a new subscription. You can safely delete this file, because this code will be moved into a React component instead.

Signed Cookie

Section 3.1.1 discusses a signed cookie to authorize the connection. This can be accomplished by using a Warden initialization hook. Keep in mind that the initializer in the article should be placed in config/initializers/warden_hooks.rb instead of app/config/initializers/warden_hooks.rb. If your Rails server is curr

React on Rails with Test Suite (Karma, Jasmine, Enzyme, PhantomJS)

The steps included here detail the steps I followed to get a new React on Rails app set up, with a focus on testing JS components with Karma / Jasmine / Enzyme. A lot of this was liberally borrowed / modified from the Launch Academy curriculum, but there are some additional steps involved to get everything working with webpacker:

Unless otherwise specified, run the code in the terminal

Install Rails with Webpacker configured for React:

rails new project-name
cd project-name

How to break long lines up in Ruby

This page lists the options for breaking single-line expressions into multiple lines in Ruby.

Developers and teams need to come to their own decisions about which guideline(s) they prefer (preferences below are just my personal choices and I encourage you to disregard them).

# With trailing parens
x = [1, 2, 3].join(
 '-'

Stuff I wish I'd known sooner about service workers

I recently had several days of extremely frustrating experiences with service workers. Here are a few things I've since learned which would have made my life much easier but which isn't particularly obvious from most of the blog posts and videos I've seen.

I'll add to this list over time – suggested additions welcome in the comments or via twitter.com/rich_harris.

Use Canary for development instead of Chrome stable

~~Chrome 51 has some pretty wild behaviour related to console.log in service workers. Canary doesn't, and it has a load of really good service worker related stuff in devtools.~~


	FILE SPACING:

	# double space a file
	sed G

	# double space a file which already has blank lines in it. Output file
	# should contain no more than one blank line between lines of text.
	sed '/^$/d;G'

	map2 : (a -> b -> c) -> Validatable a -> Validatable b -> Validatable c
	map2 func v1 v2 =
	case ( v1, v2 ) of
	( Invalid a fatal warnings, Valid b ) ->
	Invalid (func a b) fatal warnings

	( Invalid a fa wa, Warnings b wb ) ->
	Invalid (func a b) fa (wa ++ Nonempty.toList wb)

	( Invalid a fa wa, Invalid b fb wb ) ->

	// the cache version gets updated every time there is a new deployment
	const CACHE_VERSION = 10;
	const CURRENT_CACHE = `main-${CACHE_VERSION}`;

	// these are the routes we are going to cache for offline support
	const cacheFiles = ['/', '/about-me/', '/projects/', '/offline/'];

	// on activation we clean up the previously registered service workers
	self.addEventListener('activate', evt =>
	evt.waitUntil(

	--- ----------------- ----
	Map Quick Explanation Link
	--- ----------------- ----
	< <F1> Causes Netrw to issue help
	<cr> Netrw will enter the directory or read the file \|netrw-cr\|
	<del> Netrw will attempt to remove the file/directory \|netrw-del\|
	<c-h> Edit file hiding list \|netrw-ctrl-h\|
	<c-l> Causes Netrw to refresh the directory listing \|netrw-ctrl-l\|
	<c-r> Browse using a gvim server \|netrw-ctrl-r\|
	<c-tab> Shrink/expand a netrw/explore window \|netrw-c-tab\|