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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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Set the Mac OS X SOCKS proxy on the command line

a.k.a. what to do when your ISP starts blocking sites :(

Set the SOCKS proxy to local SSH tunnel

networksetup -setsocksfirewallproxy "Ethernet" localhost 8080

To clear the domain and port

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#!/usr/bin/env ruby
# A quick and dirty implementation of an HTTP proxy server in Ruby
# because I did not want to install anything.
# 
# Copyright (C) 2009 Torsten Becker <torsten.becker@gmail.com>

require 'socket'
require 'uri'

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class PdfMerger
  
  def merge(pdf_paths, destination)
    
    first_pdf_path = pdf_paths.delete_at(0)
    
    Prawn::Document.generate(destination, :template => first_pdf_path) do |pdf|
      
      pdf_paths.each do |pdf_path|
        pdf.go_to_page(pdf.page_count)

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require 'spec_helper'

describe Users::OauthCallbacksController, "handle facebook authentication callback" do
  
  describe "#annonymous user" do
    context "when facebook email doesn't exist in the system" do
      before(:each) do
        stub_env_for_omniauth

        get :facebook

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source 'https://rubygems.org'

gem 'active_model_serializers', git: 'git://github.com/rails-api/active_model_serializers.git'
gem 'ember-rails', git: 'git://github.com/emberjs/ember-rails.git' # so we get the pre version
gem 'rack-mini-profiler', git: 'git://github.com/SamSaffron/MiniProfiler'
gem 'vestal_versions', git: 'git://github.com/zhangyuan/vestal_versions'

gem 'message_bus', path: 'vendor/gems/message_bus'
gem 'rails_multisite', path: 'vendor/gems/rails_multisite'
gem 'simple_handlebars_rails', path: 'vendor/gems/simple_handlebars_rails'

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Asking questions, the right way

First, #vruby focuses in technical side, we should not chit/chat or talk too much about subjects not relate to technical side

Second, hen asking questions in the #vruby channel, please follow these 12 simple rules. Can't count that high? The first 7 will get you in most people's good books.

1. Do your research before hand. Your question may be answerable with a quick Google search or by simply experimenting. If you're using a method in Rails, look it up in the API Docs or in the Official Guides.
2. If you've tried Googling, explain what terms you've tried to use so people can better help you.
3. Clearly explain what is happening and create a Gist (http://gist.github.com) or Pastie (http://pastie.org) of the code that is causing the problem you are encountering, as well as any useful output like stacktraces. A "Full Trace" as opposed to the default "Application Trace" is preferred. *NO FAKE CODE. If you're

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Python Number Conversion Chart

From	To	Expression

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GitHub Flow

• Scott Chacon on the Interwebs

31 Aug 2011

git-flowの問題点 (Issues with git-flow)

私は人々にGitを教えるためにあちこちを飛び回っているが、最近のほぼすべてのクラスやワークショップでgit-flowについてどう思うかを尋ねられた。私はいつも、git-flowは素晴らしいと思うと答えている。何百万ものワークフローを持ったシステム（Git）を提供し、ドキュメントもあるし、よくテストされている。フレキシブルなワークフローは、実に容易なやり方で多くの開発者の役に立つ。標準的なものになりつつあり、開発者はプロジェクトや企業の間を移動しつつこの標準的なワークフローに馴染むことができる。

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# Author: Pieter Noordhuis
# Description: Simple demo to showcase Redis PubSub with EventMachine
#
# Update 7 Oct 2010:
# - This example does *not* appear to work with Chrome >=6.0. Apparently,
#   the WebSocket protocol implementation in the cramp gem does not work
#   well with Chrome's (newer) WebSocket implementation.
#
# Requirements:
# - rubygems: eventmachine, thin, cramp, sinatra, yajl-ruby