MRI/JRuby/Rubinius discrepency

gistfile1.txt

MRI - detect with a lambda complains about 2 parameters but map works

    $ irb
    2.1.1 :001 > lambda = ->(word, index) { word.length == 3 }
     => #<Proc:0x007fb52d00ab38@(irb):1 (lambda)>
    2.1.1 :002 > %w(Hi there how are you).each_with_index.detect &lambda
    ArgumentError: wrong number of arguments (1 for 2)
      from (irb):1:in `block in irb_binding'
      from (irb):2:in `each'
      from (irb):2:in `each_with_index'
      from (irb):2:in `each'
      from (irb):2:in `detect'
      from (irb):2
      from /Users/alex/.rvm/rubies/ruby-2.1.1/bin/irb:11:in `<main>'
    2.1.1 :003 > %w(Hi there how are you).each_with_index.map &lambda
     => [false, false, true, true, true]
 
JRuby - detect and map both work

    $ jirb
    jruby-1.7.10 :001 > lambda = ->(word, index) { word.length == 3 }
     => #<Proc:0x46c95759@(irb):1 (lambda)>
    jruby-1.7.10 :002 > %w(Hi there how are you).each_with_index.detect &lambda
     => ["how", 2]
    jruby-1.7.10 :003 > %w(Hi there how are you).each_with_index.map &lambda
     => [false, false, true, true, true]
 
Rubinius - detect and map both work

    $ irb
    rbx-2.2.3 :001 > lambda = ->(word, index) { word.length == 3 }
     => #<Proc:0x2c8c@(irb):1 (lambda)>
    rbx-2.2.3 :002 > %w(Hi there how are you).each_with_index.detect &lambda
     => ["how", 2]
    rbx-2.2.3 :003 > %w(Hi there how are you).each_with_index.map &lambda
     => [false, false, true, true, true]