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What is the return value of the following Ruby code?
require 'set' tags = SortedSet.new tags << :ruby tags << :algol tags << :lua tags << :ruby tags.to_a # => ???
The correct answer is
[:ruby, :algol, :lua, :ruby]
It raises DuplicatesError
[:algol, :lua, :ruby]
[:ruby, :algol, :lua]
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The SortedSet class allows you to create an ascending collection of unique sorted values.
When requiring the 'set' Standard Library (and if the sorted_set gem has been installed) the SortedSet class will be automatically available.
Indeed, this class has been extracted into a gem and this gem is currently maintained by Akinori Musha who is a trusted Ruby committer.
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