havenwood

module ApplicationHelper
  def bell_notification_with_conditional_counter
    keyword_arguments = {class: 'notification-bell'}
    keyword_arguments[:data] = {count: '...'} if Notification.unread_count(current_user).nonzero?

    icon("fas", "bell", **keyword_arguments)
  end
end

havenwood

class Hangman
  DICTIONARY = ["cat", "dog", "bootcamp", "pizza"]
  def initialize()
    @secret_word = Hangman.random_word
    @guess_word = Array.new(@guess_word.length, "-")
    @attempted_chars = Array.new
    @remaining_incorrect_guesses = 5
  end

havenwood

require 'fiddle'

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

havenwood

#!/usr/bin/env ruby

require 'fiddle/import'

module GVLUnlock
  extend ::Fiddle::Importer
  dlload ::Fiddle::Handle::DEFAULT
  FP = 
    bind 'void *cb(void *data)' do |ptr|
      ptr.to_i << 1

havenwood

~ ruby json_benchmark.rb
String to JSON
Warming up --------------------------------------
             Oj.dump    24.918k i/100ms
           Yajl.dump     9.461k i/100ms
           JSON.dump    24.797k i/100ms
    MessagePack.dump    44.355k i/100ms
Calculating -------------------------------------
             Oj.dump    267.683k (± 3.4%) i/s -      1.346M in   5.032971s
           Yajl.dump     98.929k (± 2.8%) i/s -    501.433k in   5.072850s

havenwood

# Identity functor that does not give any additional structure
Identity = Struct.new(:value) do
  def fmap(func = nil, &blk)
    f = func || blk;
    Identity.new(f.call(self.value))
  end
end

# Const Functor that preserves its content
Const = Struct.new(:value) do

havenwood

require 'fiddle'

class Object
  def cast(as)
    # Make sure iv table of the new class gets initialized.
    as.new.send(:instance_variable_set, :@nil, nil)
    rbasic = Fiddle::Pointer.new(__id__ <<  1)
    as_klass = Fiddle::Pointer.new(as.__id__ << 1)
    
    # Ruby guarantees sizeof(VALUE) == sizeof(void *)

havenwood

Rails Girls L.A. The Third Level

[ ] I have an editor. It is ___________________.

---

[ ] I can show you where my terminal is and a few commands.

• I can show where I am in the directories.
• List the files in a particular directory.
• Make a directory.

havenwood

# Determines how many cpus the virtual machine should be given. Uses half of
# what's available on the host with a default of 4.
def numvcpus
  begin
    os_cpu_cores / 2
  rescue
    4
  end
end

havenwood

#!/bin/sh

gem search --no-vers | parallel -j0 -I$ 'curl -O `curl https://rubygems.org/api/v1/gems/$.json | jq -r .gem_uri`'