Marc-Andre Lafortune wrote:
>  *     Hash[ [ ["a" => 100], ["b" => 200] ] ]   #=> {"a"=>100, "b"=>200}

This one isn't quite right...

irb(main):003:0> Hash[ [ ["a" => 100], ["b" => 200] ] ]
=> {{"a"=>100}=>nil, {"b"=>200}=>nil}

irb(main):005:0> RUBY_VERSION
=> "1.9.1"
irb(main):006:0> RUBY_RELEASE_DATE
=> "2009-01-30"

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407