From: "Peña, Botp" <botp@...>
Date: 2008-07-01T19:58:33+09:00
Subject: Re: Hash#select returns an array but Hash#reject returns a hash...

From: Srijayanth Sridhar [mailto:srijayanth@gmail.com] 
# irb(main):001:0> a=Hash.new
# => {}
# irb(main):002:0> a[1]=2
# => 2
# irb(main):003:0> a[2]=2
# => 2
# irb(main):004:0> a[3]=4
# => 4
# irb(main):005:0> a.select { |key,value| value > 2 }
# => [[3, 4]]
# irb(main):006:0> a.reject { |key,value| value <= 2 }
# => {3=>4}

that will change in newer version of ruby, eg ruby1.9

irb(main):015:0> RUBY_VERSION
=> "1.9.0"
irb(main):016:0> a=Hash.new
=> {}
irb(main):017:0> a[1]=2
=> 2
irb(main):018:0> a[2]=2
=> 2
irb(main):019:0> a[3]=4
=> 4
irb(main):020:0> a.select { |key,value| value > 2 }
=> {3=>4}
irb(main):021:0> a.reject { |key,value| value <= 2 }
=> {3=>4}

kind regards -botp