abinoam

#!/usr/bin/env ruby

# If no local variable is found,
# it begins the method lookup that ends calling 
# the method_missing chain until the last one raises the error

begin
  p undefined_name if true
rescue 
  puts "Raised an error"

abinoam

class MegaLotto
  NUMBERS = 5
  
  def draw
    Array.new(NUMBERS){ single_draw }
  end
  
  private
  
  def single_draw

abinoam

#!/usr/bin/env ruby

def the_main_script
  # Your main script
  # Do whatever here
  x = rand(3)
  puts "x = #{x}"
  puts "and 10/#{x} = #{10/x}" # When x==0 ZeroDivisionError
end

abinoam

require 'psych'

class ScalarHandler < Psych::Handler

  def parser=(parser)
    @parser=parser
  end

  def mark
    @parser.mark

abinoam

def append_data_to_daily_files
  Dir.entries('A').each do |file|
    next unless file.match(/today/i)
    File.open(File.join("A",file), 'a') do |file|
      file.puts("hello")
    end
  end
end

abinoam

#!/usr/bin/env ruby

regexp = /^([A-Z]{1,4})([0-9]{1,4})$/

text_phrases = 
  [ "ABCD1234", 
    "ABCDE1234", 
    "ABCD12345", 
    "ABCDE12345"]

abinoam

require 'benchmark' 

n = 100_000
ar = [4,5,6,4,5,6,6,7]
Benchmark.bm(15) do |b|
 b.report("Ralph Shneiver:"){ n.times { result = Hash.new(0); ar.each { |x|  result[x] += 1 }; result} }
 b.report("Sigurd:")        { n.times { ar.inject(Hash.new(0)) {|res, x| res[x] += 1; res } } }
 b.report("Keinich #1")     { n.times { Hash[ar.group_by{|n|n}.map{|k,v|[k, v.size]}] } }
 b.report("Keinich #2")     { n.times { Hash.new(0).tap{|h|ar.each{|n|h[n] += 1}} } }
 b.report("Magnus Holm:")   { n.times { ar.each_with_object(Hash.new(0)) { |x, res| res[x] += 1 } } }