pithyless

require 'method_struct'

class CheckForN1Queries < MethodStruct.new(:generator, :operation, :debug)
  IGNORED_SQL = [
    /^SHOW/, /^EXPLAIN/, /^PRAGMA (?!(table_info))/, /^SELECT currval/, /^SELECT CAST/,
    /^SELECT @@IDENTITY/, /^SELECT @@ROWCOUNT/, /^SAVEPOINT/, /^ROLLBACK TO SAVEPOINT/,
    /^RELEASE SAVEPOINT/, /^SHOW max_identifier_length/
  ]

  def call

pithyless

One time:

git remote add upstream git@github.com:foo/bar.git
git fetch upstream
git checkout -b upstream upstream/master

Each time you want to update:

git checkout upstream
git pull

pithyless

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

pithyless

# config/initializers/char_converter.rb
require 'uri'

module Support
  class CharConverter

    SANITIZE_ENV_KEYS = [
      "HTTP_COOKIE",     # bad cookie encodings kill rack: https://github.com/rack/rack/issues/225
      "HTTP_REFERER",
      "PATH_INFO",

pithyless

0123    0123    0123    0123    0123    0123    0123    0123     0123    0123
1       1 _     1 _     1       1 _     1 _     1 _     1 _      1 _     1 _
2  |    2 _|    2 _|    2|_|    2|_     2|_     2  |    2|_|     2|_|    2| |
3  |    3|_     3 _|    3  |    3 _|    3|_|    3  |    3|_|     3 _|    3|_|



000101100
+4 +7 -5 +6
0 -  2 4 6789

pithyless

module Equalable
  def ==(o)
    o.class == self.class && o.equality_state == equality_state
  end
  alias_method :eql?, :==

  def hash
    equality_state.hash
  end
end

pithyless

# https://gist.github.com/2032303

module MiniTest::Assertions
  def assert_palindrome(string)                                                
    assert string == string.reverse, "Expected #{string} to read the same way backwards and forwards"
  end
    
  def assert_default(hash, default_value)
    assert default_value == hash.default, "Expected #{default_value} to be default value for hash but was #{hash.default.inspect}"
  end

pithyless

get '/give/me/gazebo/not/gazelle/:min_size' do

  pricing = PriceCalculator.new

  ParamsExtractor.new(pricing).parse(params)
  GazelleFinder.new(pricing).find_all_gazelles
  GazelleFilter.new(pricing).remove_sick_gazelles       # pricing has access to #gazelles

  GazeboBuilder.new(pricing).calculate_size_of_gazebo
  GazeboPricer.new(pricing).calculate_final_price       # pricing no longer has #gazelles

pithyless

class GroupOfThingies
  attr_accessor :thingies

  # Use like this:
  #
  #   group_of_thingies = GroupOfThingies.new
  #   group_of_thingies.each do |thing|
  #     puts "Check out this awesome thing: #{thing}!"
  #   end
  #

pithyless

# Do you ever define #method_missing and forget #respond_to? I sure
# do.  It would be nice if we could do them both at the same time.

module MatchMethodMacros
  def match_method(matcher, &method_body) 
    mod = Module.new do
      define_method(:method_missing) do |method_name, *args|
        if matcher === method_name.to_s
          instance_exec(method_name, *args, &method_body)
        else