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Sort with block

require 'set' w = Set['apple','Beet','carrot']  # A set of words to sort w.sort                         # ['Beet','apple','carrot']: alphabetical w.sort {|a,b| b<=>a }          # ['carrot','apple','Beet']: reverse w.sort {|a,b| a.casecmp(b) }   # ['apple','Beet','carrot']: ignore case w.sort {|a,b| b.size<=>a.size} # ['carrot','apple','Beet']: reverse length