Hieu Pham (Andromeda / Platform Pillar) phthhieu

i3 Window Manager Cheat Sheet

$mod refers to the modifier key (alt by default)

General

startx i3 start i3 from command line
$mod+<Enter> open a terminal
$mod+d open dmenu (text based program launcher)
$mod+r resize mode ( or to leave resize mode)
$mod+shift+e exit i3

Phantom types in ReasonML

Introduction

"A phantom type is a parametrised type whose parameters do not all appear on the right-hand side of its definition..." Haskell Wiki, PhantomType

The following write-up is intended as an introduction into using phantom types in ReasonML.

Taking a look at the above definition from the Haskell wiki, it states that phantom types are parametrised types where not all parameters appear on the right-hand side. Let's try to see if we can implement a similar example as in said wiki.

Visual Regression Testing with Jest

This is a walkthrough of how to set up Visual Regression Testing with Jest for an application created with create-react-app.

The following walkthrough uses React as an example, but the approach should work for any modern frontend library! I assume it can be used with Angular, Vue, Cycle.js and more.

This gist walks you through a create-react-app application as an example of how to set up Visual Regression Testing in Jest using libraries I wrote recently which enable this: jsdom-screenshot, jest-transform-css and jest-transform-file.

How to find F# jobs

People often ask me how to find F# jobs. I don't have any special connections to companies using F#, and I don't have any special tricks either. I wish I did!

So, given that, here's my take on F# jobs.

Job hunting

For job hunting my suggestions are:

	#
	# Build configuration for Circle CI
	#

	general:
	artifacts:
	- /home/ubuntu/your-app-name/app/build/outputs/apk/

	machine:
	environment:

	<!DOCTYPE html>
	<html>
	<head>
	<style>
	body {
	height: 100%;
	margin: 0;
	width: 100%;
	overflow: hidden;
	}

	keycode 8 =
	keycode 10 = 1 exclam
	keycode 11 = 2 at at
	keycode 12 = 3 numbersign
	keycode 13 = 4 dollar dollar
	keycode 14 = 5 percent
	keycode 15 = 6 asciicircum
	keycode 16 = 7 ampersand braceleft
	keycode 17 = 8 asterisk bracketleft
	keycode 18 = 9 parenleft bracketright

	// void operator
	void 0 // returns undefined
	void (0) // returns undefined
	void 'abc' // returns undefined
	void {} // returns undefined
	void (1 === 1) // returns undefined
	void (1 !== 1) // returns undefined
	void anyfunction() // returns undefined

	// A demonstration of sorting objects with Ord instances
	// equals :: Setoid a => a ~> a -> Boolean
	// lte :: Ord a => a ~> a -> Boolean

	/*
	* Data Constructors, and their Setoid and Ord instances
	*/

	// I'm using the daggy library to make constructors https://github.com/fantasyland/daggy
	const daggy = require('daggy')

	open Relude.Globals;

	module R = Relude;

	let (>>=) = IO.(>>=);

	let fetchPostById: string => IO.t(string, string) =
	id =>
	Fetch.fetch("https://jsonplaceholder.typicode.com/posts/" ++ id)
	\|> Js.Promise.then_(Fetch.Response.text)