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// Sums all "number" arguments given. This includes floats by default.
//
//   sum(1, 2, 3, 4, 5, 6, 7, 8, 9, 10); //=> 55
//   sum(1, "hey", 2, "3", 4, "five", 6, 'hi!', 7, 8.2, 9, 10); //=> 47.2
function sum() {
  var sum = 0;
  for (i = 0; i < arguments.length; i++) {
    var arg = arguments[i];
    if (typeof arg === 'number') sum += arg;
  }

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body, table, td, th, p, a, img { margin:0 auto; padding:0; }
thead, tbody, tr { margin:0; padding:0; }

body, table.body-table, table.body-table td.body-td {
  background-color:#ffffff;
  color:#333333;
  font-family:"Lucida Grande", Arial, Helvetica, sans-serif;
  font-size:16px;
  line-height:24px;
  margin:0;

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class SmartEnumerator < Enumerator
  attr_reader :length

  def initialize(enumerable)
    super
    @length = enumerable.length
  end

  def each
    self.each_with_index do |item, index|

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Install Rails 3.1

gem install rails

generate new app, skipping Test::Unit file generation

rails new my_app -T

Set up Gemfile

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# Shell commands
alias @='pwd'

# Bundler
alias brake='bundle exec rake'
alias be='bundle exec'

# Rails 2
alias sc='script/console'
alias sg='script/generate'

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# Having some fun with a simple Fibonacci sequence Hash!

fibonacci = Hash.new {|hash, key| hash[key] = hash[key - 1] + hash[key - 2]}
#=> {}

# Gotta get things started here…

fibonacci[1] = 1
#=> 1