iande

A XOR B

(A * ~B) + (~A * B)

F + (A * ~B) + (~A * B) + F

(A * ~A) + (A * ~B) + (~A * B) + (B * ~B)

(A * (~A + ~B)) + ((~A + ~B) * B)

iande

module SomeAPI
  def self.get_var mod, meth
    vars_for(mod)[meth]
  end
  
  def self.set_var mod, meth, val
    vars_for(mod)[meth] = val
  end
  
  def self.vars_for mod

iande

class Message
  class << self
    def some_meth; "Hello from Message"; end
  end
end


class Version < Message
  class << self
    def some_meth; "Hello from Version"; end

iande

irb(main):001:0> hsh = { :a => "A", :b => "B" }
=> {:a=>"A", :b=>"B"}
irb(main):002:0> a_key = "a"
=> "a"
irb(main):003:0> a_val = "a"
=> "a"
irb(main):004:0> key = "#{a_val}.to_sym"
=> "a.to_sym"
irb(main):005:0> hsh[key]
=> nil

iande

export PATH="/Users/chaos/.rvm/gems/ruby-1.9.2-p180@global/bin:/bin:/bin:/Users/chaos/.rvm/bin:$PATH"
rvm_path='/Users/chaos/.rvm' ; export rvm_path
RUBY_VERSION='ruby-1.9.2-p180' ; export RUBY_VERSION
GEM_HOME='/Users/chaos/.rvm/gems/ruby-1.9.2-p180@global' ; export GEM_HOME
GEM_PATH='/Users/chaos/.rvm/gems/ruby-1.9.2-p180@global:' ; export GEM_PATH
unset MY_RUBY_HOME
unset IRBRC
rvm_ruby_string='ruby-1.9.2-p180' ; export rvm_ruby_string
unset rvm_gemset_name
unset MAGLEV_HOME

iande

#!/usr/bin/env bash

if [[ -s "/Users/chaos/.rvm/environments/ruby-1.9.2-p180@global" ]]
then
  source "/Users/chaos/.rvm/environments/ruby-1.9.2-p180@global"
  exec ruby "$@"
else
  echo "ERROR: Missing RVM environment file: '/Users/chaos/.rvm/environments/ruby-1.9.2-p180@global'" >&2
  exit 1
fi

iande

module MyMod

  class << self
    attr_reader :my_reader
  end

  attr_reader :my_other_reader

  module_function :my_other_reader
end

iande

def self.make_year(year, bias)
  # Check for year > 2 digits, etc
  # ...
  start_year = Chronic.time_class.now.year - bias
  century = (start_year / 100) * 100
  full_year = century + year
  if full_year < start_year
    full_year + 100
  else
    full_year

iande

rvm use ruby-1.9.2
gem install open_gem
gem sandbox install flog

iande

class String
  def levenshtein other
    # .. left as exercise for the reader
  end

class Object
  def method_missing meth, *args, &block
    meth_str = meth.to_s
    new_meth = self.methods.map do |m|
      [meth_str.levenshtein(m.to_s), m]