tenderlove

module Visitable
  def accept object
    object.visit self
  end
end

class Visitor
  def visit thing
    send(:"visit_#{thing.class.name}", thing)
  end

wycats

class Object
  def send_through(object, *args)
    object.dispatcher_for(self).call(self, *args)
  end
end

module Dispatcher
  class DispatcherNotFound < StandardError; end

  def self.extended(klass)

mikiobraun

# This file extends the Kernel's require function and adds the 
# AutoReload module which allows to reload files once they have changed
# on the disk.
#
# Basically, you just require your files as usual, and if you want to update
# the files, either call AutoReload.reload(file) or AutoReload.reload_all.
#
# Usage:
#   irb -rautoload
#

adomokos

class CarElement
  def accept(visitor)
    raise NotImpelementedError.new
  end
end

module Visitable
  def accept(visitor)
    visitor.visit(self)
  end

Serabe

require 'matrix'

def regression x, y, degree
  x_data = x.map {|xi| (0..degree).map{|pow| (xi**pow) }}
  mx = Matrix[*x_data]
  my = Matrix.column_vector y

  ((mx.t * mx).inv * mx.t * my).transpose.to_a[0].reverse
end

kennym

#!/usr/bin/env ruby
#
# Convert blogger (blogspot) posts to jekyll posts
#
# Basic Usage
# -----------
#
#   ./blogger_to_jekyll.rb feed_url
#
#  where `feed_url` can have the following format:

lucasfais

Sublime Text 2 – Useful Shortcuts (Mac OS X)

General

⌘T	go to file
⌘⌃P	go to project
⌘R	go to methods
⌃G	go to line
⌘KB	toggle side bar
⌘⇧P	command prompt

ambar

Sublime Text 2 – Useful Shortcuts (Mac OS X)

General

⌘T	go to file
⌘⌃P	go to project
⌘R	go to methods
⌃G	go to line
⌘KB	toggle side bar
⌘⇧P	command prompt

olivierlacan

# switch default editor for pry to sublime text
Pry.config.editor = "sublime"

# format prompt to be <Rails version>@<ruby version>(<object>)>
Pry.config.prompt = proc do |obj, level, _|
  prompt = "\e[1;30m"
  prompt << "#{Rails.version} @ " if defined?(Rails)
  prompt << "#{RUBY_VERSION}"
  "#{prompt} (#{obj})>\e[0m"
end

igrigorik

# Convert any YouTube video into an audio file you can listen to on the go, using:
#   http://rg3.github.com/youtube-dl/

{ ~ } > brew install ffmpeg

{ ~ } > wget https://raw.github.com/rg3/youtube-dl/2012.02.27/youtube-dl
{ ~ } > chmod u+x youtube-dl

# Pick which video format you want to download.. (use any YT video link)
{ ~ } > ./youtube-dl -s -F http://www.youtube.com/watch?v=vT1KmTQ-1Os