benolee

monads are an abstraction

objects are an abstraction

They're two very different abstractions :-)

In my opinion, monads are much simpler than objects.

Because monads are only abstractions of structure, where you get to change the meaning yourself. >

benolee

# fyi: I have no idea what I'm doing :)

Log = Struct.new :buffer do
  def call method
    buffer << "Log: before #{method.name}\n"
    method.call buffer
    buffer << "Log: after #{method.name}\n\n"
    self
  end
end

benolee

# make this script run, update your gist with the running script, and it's
# output in a separate gist.  the entire quzi should take 1-3 minutes, but you
# get 5.
#


# the meat - take < 5 minutes to do this
#
  assert :hash do
    x = x.to_h

benolee

def get_rstring(addr):
  s = addr.cast(string_t.pointer())
  if s['basic']['flags'] & (1 << 13):
    return s['as']['heap']['ptr'].string()
  else:
    return s['as']['ary'].string()

def get_lineno(iseq, pos):
  if pos != 0:
    pos -= 1

benolee

# MODEL

class Case < ActiveRecord::Base
  include Eventable
  
  has_many :tasks

  concerning :Assignment do
    def assign_to(new_owner:, details:)
      transaction do

benolee

class AssignCaseCommand < Command

  attribute :case, Case
  attribute :owner, User
  attribute :created_by, User
  attribute :comments, String
  attribute :distribute_at, DateTime
  attribute :distribute_rule_name, String
  attribute :require_initial, Boolean

benolee

Convert MOV to GIF using FFmpeg and ImageMagick

I tried a few different techniques to make a GIF via command-line and the following gives me the best control of quality and size. Once you're all setup, you'll be pumping out GIFs in no time!

Preparation

Install FFmpeg

• $ brew install ffmpeg [all your options]
  • Example: $ brew install ffmpeg --with-fdk-aac --with-ffplay --with-freetype --with-frei0r --with-libass --with-libvo-aacenc --with-libvorbis --with-libvpx --with-opencore-amr --with-openjpeg --with-opus --with-rtmpdump --with-schroedinger --with-speex --with-theora --with-tools

Install ImageMagick

benolee

# Convenient way to fetch URLs. It follows redirections and handles SSL. Usage:
#   Net::HTTP.fetch_url('http://google.com')
#   Net::HTTP.fetch_url('https://www.google.fr/?q=ruby')
module Net
  class HTTP
    def self.fetch_url(url, limit = 10)
      raise ArgumentError, 'HTTP redirect too deep' if limit == 0
      url = URI.parse(url)
      options = {use_ssl: url.scheme.downcase == 'https'}
      request = Net::HTTP::Get.new(url.path.to_s + '?' + url.query.to_s)

benolee

   Link: [1]RSS (alternate)

   NOTE:This blog had a good run, but is now in retirement.
   If you enjoy the content here, please support Gregory's ongoing work on
   the [2]Practicing Ruby journal.

        [3]Gregory Brown [4]James Britt [5]Robert Klemme [6]Magnus Holm

                             [7]Ruby Best Practices

benolee

# use from pry or whatever. must have bundler loaded.
# `gem install bcat` beforehand. it doesn't have to be in your gemfile.
# example: "hello from ruby".bcat #=> opens in default web browser
class String
  def bcat
    pull, push = IO.pipe

    Bundler.with_original_env do
      fork do
        push.close