すみません10連発じゃなくて、Ruby 1.9 を使おうよ！って内容になってます。

7. require 'win32ole'
app = WIN32OLE.new('Excel.Application')
book = app.Workbooks.Open(app.GetOpenFilename)
for row in book.ActiveSheet.UsedRange.Rows do
for cell in row.Columns do
p cell.Name
p cell.Age
end
end
book.close(false)
app.quit
via http://jp.rubyist.net/magazine/?0027-ExcellentRuby

8. require "yaml"
people = []
for row in book.ActiveSheet.UsedRange.Rows
do
for cell in row.Columns do
people << {:name => cell.Name, :age =>
cell.Age}
end
end
File.open 'people.yml', 'w' do |file|
YAML.dump(people, file)
end

9. require 'yaml'
people = YAML.load_file 'people.yml'
people.each do |person|
p = Person.new person
p.save
end
import.rb
ruby script/runner import.rb

23. u=' '
u.encoding # => #<Encoding:UTF-8>
s = u.encode(‘Shift_JIS’)
s.encoding # => #<Encoding:Shift_JIS>

24. # Ruby 1.9
" "[0..2] # => " "
# Ruby 1.8
" "[0..2] # => "343201214"

25. $ cat hello.rb
p" "
$ ruby1.9 hello.rb
hello.rb:1: invalid multibyte char
(US-ASCII)

26. $ cat hello.rb
# vim:fileencoding=utf-8
p" "
$ ruby1.9 hello.rb
" "

27. vim
# vim:fileencoding=utf-8
emacs
# -*- coding: utf-8 -*-

31. [1, 2, 3].combination(2).to_a
# => [[1, 2], [1, 3], [2, 3]]
[1, 2, 3].permutation(2).to_a
# => [[1, 2], [1, 3], [2, 1], [2, 3], [3, 1],
[3, 2]]

32. [1, 2].product([3, 4])
# => [[1, 3], [1, 4], [2, 3], [2, 4]]
flatten
[1, [2, [3]]].flatten(1) # => [1, 2, [3]]
# Ruby 1.8
# => [1, 2, 3]

33. [0, 1, 2, 3].shuffle # => [1, 3, 0, 2]
[0, 1, 2, 3].shuffle # => [2, 0, 3, 1]
[0, 1, 2, 3].sample # => 2
[0, 1, 2, 3].sample(2) # => [3, 2]

34. [0, 1, 2, 3].take(2) # => [0, 1]
[0, 1, 2, 3].drop(1) # => [1, 2, 3]

35. # Ruby 1.8
[1,2,3,4,5].inject(0) {|result, i| result + i} # => 15
# 1.9
[1,2,3,4,5].inject(:+) # => 15
# reduce alias
[1,2,3,4,5].reduce(:+) # => 15

51. 2 w
data = (1..100).map{rand(5)+1}.map{|id| {:id => id, :value => rand(10000)}}
(1..5).map{|i| {:id => i, :sum => data.select{|h| h[:id] == i}.map{|h| h[:value]}.reduce(:+)}}