Balamurugan V R vrbala

Learn you a Haskell - In a nutshell

This is a summary of the "Learn You A Haskell" online book under http://learnyouahaskell.com/chapters.

1. Introduction

Haskell is a functional programming language.

Comprehensions in Python the Jedi way

Beautiful is better than ugly. Explicit is better than implicit.

I frequently deal with collections of things in the programs I write. Collections of droids, jedis, planets, lightsabers, starfighters, etc. When programming in Python, these collections of things are usually represented as lists, sets and dictionaries. Oftentimes, what I want to do with collections is to transform them in various ways. Comprehensions is a powerful syntax for doing just that. I use them extensively, and it's one of the things that keep me coming back to Python. Let me show you a few examples of the incredible usefulness of comprehensions.

All of the tasks presented in the examples can be accomplished with the extensive standard library available in Python. These solutions would arguably be more terse and efficient in some cases. I don't have anything against the standard library. To me there is a certain

	cmake_minimum_required(VERSION 2.8)
	project( main )
	find_package( OpenCV REQUIRED )
	add_executable( main source.cpp )
	target_link_libraries( main ${OpenCV_LIBS} )

	package akka.http.scaladsl

	import java.io.File

	import akka.http.scaladsl.unmarshalling.Unmarshal
	import akka.util.ByteString

	import scala.concurrent.duration._

	import akka.actor.ActorSystem