ruby/nucleotide-count (init)
ruby/nucleotide-count (#1)
ruby/nucleotide-count (#2) reuse count method
ruby/phone-number (init)
ruby/phone-number (#1)
ruby/phone-number (#2) better split
ruby/phone-number (#3) simplify clean
ruby/phone-number (#4) shorter regex matching
ruby/robot-name (init)
ruby/robot-name (#1)
ruby/robot-name (#2) simplify generate
ruby/triangle (#2) clearer validation
ruby/bob (#3) clearer shout? method
ruby/space-age (#4) cache earth_years