puyo

# What is it with you people and your singletons?

class Hash
  def self.from_block(&block)
    Hash[*BlockBuilder.new(&block).collected]
  end
  
  class BlockBuilder
    attr_reader :collected

puyo

require 'rubygems' rescue nil
require 'gosu'
require 'chipmunk'

class Array
  # e.g. [1,2,3].each_link yields [1,2], [2,3]
  def each_link
    prev = first
    self[1, size].each do |item|
      yield prev, item