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Install MySQL on macOS Sierra

This procedure explains how to install MySQL using Homebrew on macOS Sierra 10.12

Install Homebrew

Installing Homebrew is effortless, open Terminal and enter :
$ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
Note: Homebrew will download and install Command Line Tools for Xcode 8.0 as part of the installation process.

Install MySQL

At this time of writing, Homebrew has MySQL version 5.7.15 as default formulae in its main repository :

Making Impossible States Impossible in ReasonML

Introduction

If you have already seen Richard Feldman's talk entitled "Making Impossible States Impossible" or have read "Designing with types: Making illegal states unrepresentable" then you can skip the explanations and just head straight to the Reason examples.

This post is intended to display how to model your Reason Application to prevent creating impossible states. The benefits of being able to design a feature in this way include avoiding having to deal with complex test scenarios regarding defined business rules and a clear documentation of what is possible just by looking at the type definition. Long story short, let's see how this all works by implementing an example.

	System.config({
	//use typescript for compilation
	transpiler: 'typescript',
	//typescript compiler options
	typescriptOptions: {
	emitDecoratorMetadata: true
	},
	//map tells the System loader where to look for things
	map: {
	app: "./src",

	System.config({
	transpiler: 'typescript',
	typescriptOptions: {
	emitDecoratorMetadata: true
	},
	map: {
	app: './src'
	},
	packages: {
	app: {

	System.config({
	transpiler: 'typescript',
	typescriptOptions: {
	emitDecoratorMetadata: true
	},
	map: {
	app: './src'
	},
	packages: {
	app: {

	var str = 'class ಠ_ಠ extends Array {constructor(j = "a", ...c) {const q = (({u: e}) => {return { [`s${c}`]: Symbol(j) };})({});super(j, q, ...c);}}' +
	'new Promise((f) => {const a = function* (){return "\u{20BB7}".match(/./u)[0].length === 2 \|\| true;};for (let vre of a()) {' +
	'const [uw, as, he, re] = [new Set(), new WeakSet(), new Map(), new WeakMap()];break;}f(new Proxy({}, {get: (han, h) => h in han ? han[h] ' +
	': "42".repeat(0o10)}));}).then(bi => new ಠ_ಠ(bi.rd));';

	try {
	eval(str);
	} catch(e) {
	alert('Your browser does not support ES6!')
	}

	Quick setup for VIM
	-------------------
	Append this to your .vimrc to add merlin to vim's runtime-path:
	let g:opamshare = substitute(system('opam config var share'),'\n$','','''')
	execute "set rtp+=" . g:opamshare . "/merlin/vim"

	Also run the following line in vim to index the documentation:
	:execute "helptags " . g:opamshare . "/merlin/vim/doc"

	Quick setup for EMACS

	/*
	Slaying a UI Anti Pattern in ReasonML
	Based on Kris Jenkins original writing.
	http://blog.jenkster.com/2016/06/how-elm-slays-a-ui-antipattern.html
	*/
	type remoteData 'e 'a =
	\| NotAsked
	\| Loading
	\| Failure 'e
	\| Success 'a;

	/*
	remote-data ported to ReasonML

	See also https://github.com/krisajenkins/remotedata
	Tools for fetching data from remote sources (incl. HTTP).
	*/

	type remoteData 'e 'a
	= NotAsked
	\| Loading