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Data manipulation example (table inversion)
Special Variables and Pseudo-Variables example from a Well House Consultants training course
More on Special Variables and Pseudo-Variables [link]
Source code: answer Module: R110
# Sample program to show data reformatting capabilities of Ruby. # See associated blog article for complete description of every line # Written during a training course given by Well House Consultants fh = File.new "requests.xyz" langs = {} while fh.gets chomp! fields = split(/[, ]+/) name = fields.shift for lang in fields langs[lang] ||= [] langs[lang].push name end end for lang in langs.keys.sort langs[lang].sort! puts "#{lang}: #{langs[lang].join " "}".gsub(/(.{60,}?)\s/,"\\1\n ") end __END__ munchkin:lruby grahamellis$ ruby answer ASP: barbara delia ethel florence hazel jenny leane nina olivia petra queenie rita venus wendy xena zoe Java: barbara barry cherry david delia ed florence fred graham harry iris ivan john ken leane len morris nigel peter rupert tina tommy ulsyees uva venus xavier xena zachary MySQL: adam antonia charles cherry ethel fred gloria iris ivan kerry len margaret olivia orpheus queenie rupert sally uva victor wendy yollanda zachary PHP: antonia barry delia ed florence harry hazel john leane morris nigel olivia peter quentin rita steve ulsyees uva william xavier xena yuri zoe Perl: adam antonia barry charles cherry david ed ethel fred gloria graham hazel iris ivan jenny john ken kerry leane len margaret morris nigel nina peter petra queenie quentin rita sally steve tommy ulsyees uva venus victor wendy william xavier xena yuri zoe Python: adam barry harry hazel ken leane nigel olivia rupert Ruby: barbara charles cherry ed florence hazel ivan jenny kerry len margaret nina orpheus petra queenie quentin rita steve tina venus victor william yollanda zoe Tcl/Tk: adam antonia barbara charles david ethel gloria graham iris ivan ken kerry margaret morris nina orpheus petra quentin sally steve tina victor wendy yollanda yuri zachary XML: antonia barry delia fred gloria jenny john margaret orpheus petra sally tommy xena yuri munchkin:lruby grahamellis$ Learn about this subject
This module and example are covered on the following public courses:
* Learning to program in Ruby * Ruby Programming Also available on on site courses for larger groups Books covering this topic
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Other Examples
This example comes from our "Special Variables and Pseudo-Variables" training module. You'll find a description of the topic and some
other closely related examples on the "Special Variables and Pseudo-Variables" module index page.
Full description of the source code
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