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(Rewrite of OCaml solution to fully comply with task description; added example use.) |
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=={{header|Ruby}}== |
=={{header|Ruby}}== |
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<lang ruby>def select(prompt, items) |
<lang ruby>def select(prompt, items) |
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return "" if items. |
return "" if items.empty? |
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loop do |
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items.each_index {|i| puts "#{i}. #{items[i]}"} |
items.each_index {|i| puts "#{i}. #{items[i]}"} |
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print "#{prompt}: " |
print "#{prompt}: " |
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begin |
begin |
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answer = Integer(gets |
answer = Integer(gets) |
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rescue ArgumentError |
rescue ArgumentError |
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redo |
redo |
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end |
end |
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return items[answer] if |
return items[answer] if (0...items.length).cover?(answer) |
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end |
end |
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end |
end |
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response = select("Which is empty", []) |
response = select("Which is empty", []) |
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puts "empty list returns: >#{response}<" |
puts "empty list returns: >#{response}<" |
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puts |
puts |
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# "real" test |
# "real" test |
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