Reject without reject

rejectless.rb

a = [10, 20, 30, 40, 50]

# each stage along the way:
# >>  a.each_with_index.collect {|value,index| {index => value <= 30} }
# => [{0=>true}, {1=>true}, {2=>true}, {3=>false}, {4=>false}]
#
#   .select {|h| h.invert.has_key?(false) }
# =>  [{3=>false}, {4=>false}]
#
#   .collect {|h| h.keys}.flatten
# => [3, 4]

a.each_with_index.collect {|value,index| {index => value <= 30} } \
 .select {|h| h.invert.has_key?(false) } \
 .collect {|h| h.keys}.flatten
# => [3, 4]
# meh have to go over index again.  :(