inject-alternative.rb

# As illustrated in http://confreaks.net/videos/427-rubyconf2010-zomg-why-is-this-code-so-slow

Person = Struct.new(:name)
people = [Person.new('steve'), Person.new('bill'), Person.new('larry')]

puts people.inject({}) { |table,person| table[person.name] = person; table }
puts Hash[people.map { |person| [person.name, person] }]

# {"steve"=>#<struct Person name="steve">, "bill"=>#<struct Person name="bill">, "larry"=>#<struct Person name="larry">}