ukari

Reddit discussion.

Disclaimer 1: Type classes are great but they are not the right tool for every job. Enjoy some balance and balance to your balance.

Disclaimer 2: I should tidy this up but probably won’t.

Disclaimer 3: Yeah called it, better to be realistic.

Type classes are a language of their own, this is an attempt to document features and give a name to them.

async/await is just the do-notation of the Promise monad

CertSimple just wrote a blog post arguing ES2017's async/await was the best thing to happen with JavaScript. I wholeheartedly agree.

In short, one of the (few?) good things about JavaScript used to be how well it handled asynchronous requests. This was mostly thanks to its Scheme-inherited implementation of functions and closures. That, though, was also one of its worst faults, because it led to the "callback hell", an seemingly unavoidable pattern that made highly asynchronous JS code almost unreadable. Many solutions attempted to solve that, but most failed. Promises almost did it, but failed too. Finally, async/await is here and, combined with Promises, it solves the problem for good. On this post, I'll explain why that is the case and trace a link between promises, async/await, the do-notation and monads.

First, let's illustrate the 3 styles by implementing

JavaScript Static Analysis Tools

Most people are familiar with these three tools:

[JSHint][1]
[JSLint][2]
[Google Closure Linter][3]

The first one is more popular among developers because it is style-agnostic. The other two enforce rules of [Crockford Style][4] and [Google Code Style][5] respectively.

I believe the article was originally written by fede.tft.

It appears they have copied source code to github and updated it for C++11: https://github.com/fedetft/serial-port

Introduction

The serial port protocol is one of the most long lived protocols currently in use. According to wikipedia, it has been standadized in 1969. First, a note: here we're talking about the RS232 serial protocol. This note is necessary because there are many other serial protocols, like SPI, I2C, CAN, and even USB and SATA.

Some time ago, when the Internet connections were done using a 56k modem, the serial port was the most common way of connecting a modem to a computer. Now that we have ADSL modems, the serial ports have disappeared from newer computers, but the protocol is still widely used.

In fact, most microcontrollers, even the newer ones have one or more peripherals capable of communicating using this protocol, and from the PC side, all operating system

	REGEDIT4

	[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\FontLink\SystemLink]
	"Arial"="wqy-microhei.ttc"
	"Arial Black"="wqy-microhei.ttc"
	"Arial CE,238"="wqy-microhei.ttc"
	"Arial CYR,204"="wqy-microhei.ttc"
	"Arial Greek,161"="wqy-microhei.ttc"
	"Arial TUR,162"="wqy-microhei.ttc"
	"Courier New"="wqy-microhei.ttc"

	var zip = new JSZip();
	var count = 0;
	var zipFilename = "zipFilename.zip";
	var urls = [
	'http://image-url-1',
	'http://image-url-2',
	'http://image-url-3'
	];

	urls.forEach(function(url){

	{-# LANGUAGE CPP #-}
	{-# LANGUAGE ScopedTypeVariables #-}
	{-# LANGUAGE FlexibleInstances, FlexibleContexts #-}
	{-# LANGUAGE DataKinds, GADTs, KindSignatures, TypeOperators, UndecidableInstances #-}

	#if __GLASGOW_HASKELL__ < 708
	#error "requires GHC 7.10 or newer"
	#endif
	module Main (main) where

	Shader

	layout (location = 0) in vec3 inPos;
	layout (location = 1) in vec3 inColor;
	layout (location = 2) in vec3 inPosB;
	layout (location = 3) in vec3 inColorB;

	...

	Application

	{-# LANGUAGE
	DeriveFunctor
	, DeriveFoldable
	, DeriveTraversable
	, StandaloneDeriving
	, ViewPatterns
	, PatternSynonyms
	#-}

	-- AST independent

	{-# LANGUAGE AllowAmbiguousTypes #-}
	{-# LANGUAGE ConstraintKinds #-}
	{-# LANGUAGE DataKinds #-}
	{-# LANGUAGE FlexibleContexts #-}
	{-# LANGUAGE FlexibleInstances #-}
	{-# LANGUAGE GADTs #-}
	{-# LANGUAGE GeneralizedNewtypeDeriving #-}
	{-# LANGUAGE InstanceSigs #-}
	{-# LANGUAGE KindSignatures #-}
	{-# LANGUAGE PolyKinds #-}