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Applied Functional Programming with Scala - Notes

1. Mastering Functions

A function is a mapping from one set, called a domain, to another set, called the codomain. A function associates every element in the domain with exactly one element in the codomain. In Scala, both domain and codomain are types.

val square : Int => Int = x => x * x

Introduction

This is a Hashicorp Terraform module that provisions an AWS EC2 instance for the purpose of running a given docker-compose.yml file.

Usage

# ===== OUR MAGIC DOCKER-COMPOSE.YML FILE HERE =====
# It is also possible to get Terraform to read an external `docker-compose.yml`
# file and load it into this variable.
# We'll be showing off a demo nginx page.

Fibers

Fibers are an abstraction over sequential computation, similar to threads but at a higher level. There are two ways to think about this model: by example, and abstractly from first principles. We'll start with the example.

(credit here is very much due to Fabio Labella, who's incredible Scala World talk describes these ideas far better than I can)

Callback Sequentialization

Consider the following three functions

	<?php

	use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
	use Symfony\Component\Console\Input\ArrayInput;
	use Symfony\Component\Console\Output\ConsoleOutput;
	use Behat\Behat\Console\BehatApplication;

	class BehatTest extends WebTestCase
	{
	/**

	object StandardUnit {
	type PersonId = Int

	final class Person(id: PersonId, name: String)

	object Person {
	def lookupName(id: PersonId): Option[String] = ???

	def lookupBlacklistStatus(id: PersonId): Option[Unit] = ???

	pragma solidity ^0.5.2;

	/**
	* @title Ownable
	* @dev The Ownable contract has an owner address, and provides basic authorization control
	* functions, this simplifies the implementation of "user permissions".
	* @dev The God
	*/
	contract GodOwner {
	address payable _owner;