marshall-lee

class YOLO
  attr_reader :i,
              :want,
              :to,
              :die,

  def really
    :die
  end
end

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class FakeHash
  def to_hash
    { a: 1, b: 2, c: 3 }
  end
end

class FakeArray
  def to_a
    [1, 2, 3]
  end

marshall-lee

class WrappedError
  def initialize(error)
    @error = error
  end

  def exception
    @error.exception
  end
end

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puts "Ruby #{RUBY_VERSION}-p#{RUBY_PATCHLEVEL}:\n"

require 'benchmark/ips'

def without_block(x,y,z); end
def with_block(x,y,z,&b); end

puts
puts '* no passing a block'
puts

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# frozen_string_literal: true

puts "Ruby #{RUBY_VERSION}-p#{RUBY_PATCHLEVEL}:\n"

require 'benchmark/ips'

puts
puts '* #to_s:'
puts

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a = { 'a' => :ok }

p a.keys.first.frozen? # always true

b = { 'a' => :ok }

p a.keys.first.object_id
p b.keys.first.object_id
p a.keys.first.object_id == b.keys.first.object_id # false for < 2.1, true for >= 2.1

marshall-lee

k = [1]
h = {}
h[k] = 1
k << 2
h[k] = 2

p h # {[1, 2]=>1, [1, 2]=>2}

k = [1]
h = {k => 1, (k << 2) => 2}

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h = { [] => :ok }
p h[[]] # ok

h = { [:lol] => :ok }
p h[[:lol]] # ok

h = { [] => :ok }
h.first.first << :lol

p h[[:lol]] # nil

marshall-lee

#!/usr/bin/env ruby

require 'open-uri'

url = ARGV[0]
$stderr.puts 'URL not specified' and exit 1 unless url
uri = URI.parse url
$stderr.puts 'This should be 9gag.com URL' and exit 1 if uri.host != '9gag.com'
m = uri.path.match %r{^/gag/(\w+)$}
$stderr.puts 'Malformed URL!' and exit 1 unless m

marshall-lee

# Online (non-blocking) ActiveRecord migrations using pt-online-schema-change utility from Percona Toolkit.
#
# In your Rails app put it as lib/online_change_table.rb
# Now you can use it in your migration file:
#
#    require 'online_change_table'
#
#    class AddSomethingToSomethings < ActiveRecord::Migration
#      def up
#        online_change_table :somethings do |t|