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

You can mock the Scala tuples with this trick :

Tuple = Struct.new(:_1, :_2)

2.2.5 :003 > t = Tuple.new("a", "b")
 => #
2.2.5 :004 > t._1
 => "a"
2.2.5 :005 > t._2
 => "b"

but here you can't have destructuring:

2.2.5 :012 > a, b = t
 => {:_1=>"a", :_2=>"b"}
2.2.5 :013 > a
 => {:_1=>"a", :_2=>"b"}
2.2.5 :014 > b
 => nil

But thanks to this trick : https://gist.github.com/stevecj/9ace6a70370f6d1a1511 destructuring will work:

2.2.5 :001 > Tuple = Struct.new(:_1, :_2)
 => Tuple
2.2.5 :002 > t = Tuple.new("a", "b")
 => #
2.2.5 :003 > t._1
 => "a"
2.2.5 :004 > class Tuple ; def to_ary ; to_a ; end ; end
 => :to_ary
2.2.5 :005 > a, b = t
 => #
2.2.5 :006 > a
 => "a"
2.2.5 :007 > b
 => "b"