Fun with the Ruby 1.9 Standard Library

fun_with_the_ruby_19_stl.rb

require 'set'

# Sorted list of random numbers
pp 10.times.each_with_object(SortedSet.new) { |n, s| s << Random.new.rand(1..100) }  

# Associative arrays
aoa = ('a'..'l').each_slice(2).to_a

Hash[aoa] #=> {"a"=>"b", "c"=>"d", "e"=>"f", "g"=>"h", "i"=>"j", "k"=>"l"}

aoa.assoc('a') #=> ["a", "b"]

aoa.rassoc('d') #=> ["c", "d"]

aoa.unshift(["a", "x", "y"]) #=> [["a", "x", "y"], ["a", "b"], ["c", "d"], ["e", "f"], ["g", "h"], ["i", "j"], ["k", "l"]]

aoa.assoc('a') #=> ["a", "x", "y"]

aoa.shift #=> ["a", "x", "y"]

aoa.assoc('a') #=> ["a", "b"]