bil-bas

# Memoising factorial method.
class Integer
  class << self
    def factorial_results(number)
      raise "number has to be greater than 0" if number < 0

      @factorial_results ||= begin
        results = Hash.new do |h, k|
          h[k] = k * @factorial_results[k - 1] 
        end

bil-bas

C:/Users/Owner/.pik/rubies/Ruby-193-p286/lib/ruby/gems/1.9.1/bundler/gems/gamebox-b492424483ab/lib/gamebox/core/timer_manager.rb:11:in `add_timer': timer [252818292:shot_recharge] already exists (RuntimeError)
        from C:/Users/Owner/RubymineProjects/Other people's junk/foxy/src/behaviors/shooter.rb:86:in `shoot_if_able'
        from C:/Users/Owner/RubymineProjects/Other people's junk/foxy/src/behaviors/shooter.rb:21:in `block (3 levels) in <top (required)>'
        from C:/Users/Owner/.pik/rubies/Ruby-193-p286/lib/ruby/gems/1.9.1/gems/publisher-1.1.2/lib/publisher.rb:83:in `call'
        from C:/Users/Owner/.pik/rubies/Ruby-193-p286/lib/ruby/gems/1.9.1/gems/publisher-1.1.2/lib/publisher.rb:83:in `block in fire'
        from C:/Users/Owner/.pik/rubies/Ruby-193-p286/lib/ruby/gems/1.9.1/gems/publisher-1.1.2/lib/publisher.rb:79:in `each'
        from C:/Users/Owner/.pik/rubies/Ruby-193-p286/lib/ruby/gems/1.9.1/gems/publisher-1.1.2/lib/publisher.rb:79:in `fire'
        from C:/Users/Owner/RubymineProjects/Oth

bil-bas

# List all values in fibonacci series <= n
def fib_up_to(n)
  return [] if n < 0 # Idiot-proofing.

  vals, succ = [0], 1

  while succ <= n
    vals << succ
    succ = vals[-1] + vals[-2]
  end

bil-bas

class Class
  def attr_accessor_with_history(attr_name)
    attr_reader attr_name
        
    class_eval %Q{
      # Create the attribute's history getter
      def #{attr_name}_history
        @#{attr_name}_history ||= [nil]
      end
      

bil-bas

class Class
  def define(method_name, argument_types = {}, &block)
    raise ArgumentError, "Block required" unless block_given?
    raise ArgumentError, "Expected argument Hash" unless argument_types.is_a? Hash
    raise ArgumentError, "Expected argument names to be Symbols" unless argument_types.each_key.all? {|x| x.is_a? Symbol }
    raise ArgumentError, "Expected argument types to be Classes" unless argument_types.each_value.all? {|x| x.is_a? Class }
    
    wrapper_class = Struct.new *argument_types.keys
    
    # Redirect all other methods to the class, so methods get called there not on the bearer of arguments.

bil-bas

=begin
Problem Solving Challenge #1 (https://gist.github.com/3818527)
Problem solving challenges are fun. They make use of one's problem solving skills and stimulate the programmer's need to challenge themselves.

Here we go
These 1151159511610110199114 numbers represent a word.

The word may only contain a-zA-Z_
The word is of size 8.
In this particular case the secret word was s_ecrets.

bil-bas

# Enumerable Fibonacci sequence
module Fibonacci  
  class << self
    include Enumerable  
    
    def [](index)
      raise "index must be >= 0" unless index >= 0
      raise "index must be an Integer" unless index.is_a? Integer

      find.with_index {|n, i| i == index }

bil-bas

  def parse(page)
    table = page.at("table.grid")
    rows = table.search("tr").to_a[1..-1]
    rows.each.with_object [] do |row, rows|
      row = parse_row row.search("td").map(&:text)
      rows << row if row
    end
  end

  def parse_row(row)

bil-bas

# code.rb contains:
#   class Frog
#   end

module MyModule
  class_eval File.read("./code.rb"), "code.rb", 1
end

p MyModule::Frog # Will succeed.
p Frog           # Will fail.

bil-bas

# List all objects where there are > 1 instance

h = Hash.new(0)
ObjectSpace.each_object {|o| h[o.class] += 1 }
h.select {|k, v| v > 1 }.sort_by {|k, v| -v }.each {|k, v| puts "#{k}: #{v}" };