Using Tuples in Ruby?

Question

Does anyone use tuples in Ruby? If so, how may one implement a tuple? Ruby hashes are nice and work almost as well, but I\'d really like to see something like the Tuple clas

Answer 1

Arrays are cool to use as tuples because of destructuring

a = [[1,2], [2,3], [3,4]]
a.map {|a,b| a+b }

Struct give you convenient . accessors

Person = Struct.new(:first_name, :last_name)
ppl = Person.new('John', 'Connor')
ppl.first_name 
ppl.last_name

You can get the convenience of both worlds with to_ary

Person = Struct.new(:first_name, :last_name) do
  def to_ary
    [first_name, last_name]
  end
end
# =>
[
  Person.new('John', 'Connor'), 
  Person.new('John', 'Conway')
].map { |a, b| a + ' ' + b  }
# => ["John Connor", "John Conway"]