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Advanced Functional Programming with Scala - Notes

Copyright © 2017 Fantasyland Institute of Learning. All rights reserved.

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

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#Some discussions on logging from docker: Using logstash Using Papertrail

Issue Loging Drivers

Issue Enhanced Logging

A lot of this boils down to whether you want a single or multi-process (systemd, supervisord etc.) container...

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abstract class JEnum extends Enumeration {

  case class JVal(name: String, url: Option[String]) extends Val(name) {
    lazy val successUrl: String = {
      // Should have protocol specification or YAHOO will fail
      url.getOrElse(Props.get("public.domain").getOrElse("") + "/socialauth/rest/" + this.name + "/action")
    }
  }
  protected final def JValue(name: String, url: String = null): Value = JVal(name, Option(url))
  implicit def valueToJValue(v: Value): JVal = v.asInstanceOf[JVal]

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# Being executed in the dir with a list of files with names formed as 
# 'AuthorName BookTitle.ext' or 'AuthorName,BookTitle.ext'
# creates dirs named by Author and moves author's books there
require 'fileutils'

PATH_D = File.expand_path(File.dirname(__FILE__)) + '/' #absolute path to current dir 
FILE_BASE = File.basename(__FILE__)			#script's filename

Dir.foreach("./") do |entry|
	next if entry.start_with?('.') or entry == FILE_BASE

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import java.util.Arrays;

public class Eratosthene{

    public static int[] byteEratosthenes(int cap) {
        int[] result = new int[(int) Math.ceil(1.25 * cap / Math.log(cap))];
        int pos = 1;
        result[0] = 2;
        byte[] primes = new byte[(cap - 2 >> 4) + 1];