Sukant Hajra shajra

Before Jumping into Monads

A lot of people come from popular languages that tout being "object-oriented" and they hear about something called "monads" but haven't found the time to figure them out completely. They look for a simple explanation, but run into one or more of the following problems:

too many concepts explained at once
vague explanations (including analogies that break)

Basic Humanity

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Managers of technical workers are always highly technically skilled.

	package shajra.http.client


	import scala.concurrent.duration.Duration

	import scalaz.{Functor, NonEmptyList}


	private[client] sealed abstract class HttpCommand[C, E, O] {

	Pieces you need:

	* emacs
	* ghcid

	ghcid needs to know the height of the terminal, we'll set it explicitly

	height = (window-height) - (scroll-margin) - 1

	set this height as your term-buffer-maximum-size

	{-# LANGUAGE MultiParamTypeClasses #-}
	{-# LANGUAGE FlexibleInstances #-}
	{-# LANGUAGE FlexibleContexts #-}

	import Control.Lens
	import Data.Maybe
	import Data.Monoid

	data Constant a b =
	Constant a


	// a simple process1 that splits the frames up based on a "\r\n" sequence of chars
	val partitioner = {
	import java.util.regex.Pattern
	import scalaz.stream.process1
	import scalaz.std.string._

	val pattern = Pattern.compile("\r\n")
	process1.repartition { s: String =>
	pattern.split(s, -1)

	# coding=UTF-8


	# Python Goes To Church
	# =====================

	# What would Python be like if all we had was simple (single argument) lambda
	# expressions? We could write some helpful functions like these:

	id = lambda a: a

	{-# LANGUAGE GeneralizedNewtypeDeriving #-}

	import Control.Monad.IO.Class
	import Control.Monad.Trans.Class
	import Prelude hiding (log)

	--------------------------------------------------------------------------------
	-- The API for cloud files.
	class Monad m => MonadCloud m where
	saveFile :: Path -> Bytes -> m ()

	import java.util.concurrent.ExecutorService

	import scalaz.Maybe
	import scalaz.syntax.maybe._


	final case class Pools(cpu: Maybe[Pool[Pool.Cpu]], io: Maybe[Pool[Pool.Io]])

	object Pools {
	def none: Pools = Pools(Maybe.empty, Maybe.empty)

	package shajra.tagless


	import argonaut.{ HCursor, DecodeResult, DecodeJson, Parse }
	import argonaut.Argonaut.jString
	import scalaz._
	import scalaz.Isomorphism.<~>
	import scalaz.syntax.monad._