jhass

Ruby on Archlinux

I thought I would document my setup, since it's somewhat non-standard but working quite well for me.

What this does

• Install major Ruby versions at their latest patch release
• Allow to switch between them seamlessly
• Use chruby
• Encourage bundler usage

smarr

Introductory Material

• Add Graal JIT Compilation to Your JVM Language in 5 Steps, A Tutorial http://stefan-marr.de/2015/11/add-graal-jit-compilation-to-your-jvm-language-in-5-easy-steps-step-1/

• The SimpleLanguage, an example of using Truffle with great JavaDocs. It is the officle getting-started project: https://github.com/graalvm/simplelanguage

• Truffle Tutorial, Christan Wimmer, PLDI 2016, 3h recording https://youtu.be/FJY96_6Y3a4 Slides

havenwood

#!/usr/bin/env ruby

# frozen_string_literal: true

require 'json'
require 'optionparser'

KEYWORDS = %i[color metadata glow_in_the_dark coats].freeze
DEFAULTS = {coats: 3, glow_in_the_dark: true}.freeze

ordinaryzelig

I'm a fan of MiniTest::Spec. It strikes a nice balance between the simplicity of TestUnit and the readable syntax of RSpec. When I first switched from RSpec to MiniTest::Spec, one thing I was worried I would miss was the ability to add matchers. (A note in terminology: "matchers" in MiniTest::Spec refer to something completely different than "matchers" in RSpec. I won't get into it, but from now on, let's use the proper term: "expectations").

Understanding MiniTest::Expectations

Let's take a look in the code (I'm specifically referring to the gem, not the standard library that's built into Ruby 1.9):

# minitest/spec.rb

module MiniTest::Expectations

havenwood

class ZCombinator
  def initialize improver
    @improver = improver
  end

  def call gen
    eat_its_tail(gen).(
      ->(gen) { @improver.(applicatively_eat_its_tail gen) }
    ).(gen)
  end

domgetter

map = -> f {
  -> rf {
    -> acc, elem {
      rf[acc, f[elem]]
    }
  }
}

square = -> n { n**2 }
add = -> acc, n { acc + n }

tenderlove

require 'fiddle'

class GVL
  handle  = Fiddle::Handle::DEFAULT
  address = handle['rb_thread_blocking_region']
  func = Fiddle::Function.new address, [Fiddle::TYPE_VOIDP,
                                        Fiddle::TYPE_VOIDP,
                                        Fiddle::TYPE_VOIDP,
                                        Fiddle::TYPE_VOIDP], Fiddle::TYPE_VOIDP

havenwood

Unscientific Benchmark

The Benchmark

def is_prime? n
  (2...n).all? { |i| n % i != 0 }
end

def sexy_primes n

havenwood

tmux cheatsheet

As configured in my dotfiles.

start new:

tmux

start new with session name:

havenwood

#!/usr/bin/env ruby

class Time
  WEEKDAYS = %w[ Sunday Monday Tuesday Wednesday Thursday Friday Saturday ]

  def day_before_yesterday
    xday -2
  end
  
  def yesterday