baweaver

module CodeMigrations
  # Number isn't important, vague syntax, and not all
  # of these are specifically Rails examples
  version from: 4.0, to: 5.0

  # The easiest case, literally A to B direct translation.
  class FilterToAction < Migration
    expect_translation(
      "after_filter" => "after_action",
      # ...snipped excess for example

baweaver

require "rubocop"

def tree_distance(object_a, object_b)
  tree_distance_matrix(object_a, object_b).last.last
end

def tree_distance_matrix(object_a, object_b)
  a_size, b_size = object_a.size, object_b.size

  # Rows and columns ascend from 0 to size + 1

baweaver

require 'proc_to_ast'

def where(&fn)
  ast = fn.to_ast
  source = fn.to_source

  pp ast:, source:
end

where { age > 18 && occupation.downcase == 'plumber' }

baweaver

c    = '' << 101
SUB  = /___/
subs = -> s { s.gsub(SUB, c) }
fn   = "/tmp/runs.rb"

# Patch it in for fun
`#{c}cho 'alias run #{subs['___val']}' > #{fn}`
load fn

mm = <<~ABC

baweaver

# Pattern to match a link: <a/>  
node in { name: 'a' }

# Pattern for a link with a class: <a class="foo"/>
node in { name: 'a', class: 'foo' }

# Pattern to select that link: <a class="foo">{.}</a>
node => { name: 'a', class: 'foo', children: }

# Pattern to select the target URL: <a class="foo" href="{.}"/>

baweaver

module HTML
  VALID_TAGS = %i(html p div span a ol ul li strong em table thead tr td th tbody article aside)
  SELF_CLOSING_TAGS = %i(img br hr)

  # Evaluates a block passed to it for HTML tags. This is done to isolate
  # defined tag methods from the outside world, hence `instance_eval` to
  # evaluate that block in the context of an HTML structure.
  class Evaluator
    attr_reader :contents

baweaver

require 'benchmark/ips'

class TimeFilter
  attr_reader :start, :finish

  def initialize(start, finish)
    @start = start
    @finish = finish
  end

baweaver

class Card
  SUITS        = %w(S H D C).freeze
  RANKS        = %w(2 3 4 5 6 7 8 9 10 J Q K A).freeze
  RANKS_SCORES = RANKS.each_with_index.to_h

  include Comparable

  attr_reader :suit, :rank

  def initialize(suit, rank)

baweaver

# sudo gem install bson
# sudo gem install bson_ext
# sudo gem install yajl-ruby
# sudo gem install json
# sudo gem install msgpack

require 'rubygems'
require 'benchmark'
require 'yaml'
require 'bson'

baweaver

divisible_by = -> n, v { v % n == 0 }.curry

(1..100).each { |v|
  puts case v
  when divisible_by[15] then 'FizzBuzz'
  when divisible_by[3]  then 'Fizz'
  when divisible_by[5]  then 'Buzz'
  else
    v
  end