Tuples

Syntax

# Anonymous tuple with Int32 and String values
local ranking = (1,"first")
println ranking._1  # 1
println ranking._2  # first

# Named tuple
local other_ranking = (rank:2,name:"second")
println other_ranking.rank  # 2
println other_ranking.name  # second

# Rogue automatically converts between tuple types as long as
# the element count and element types match.
other_ranking = ranking
println other_ranking.rank  # 1
println other_ranking.name  # first

# A tuple type can be specified by grouping types rather than values
routine print_ranking( r:(rank:Int32,name:String) )
  # 'r' could also be anonymous type (Int32,String)
  println "$/$"(r.rank,r.name)
endRoutine

print_ranking( ranking ) # 1/first

# Declare locals with a destructuring assignment from a tuple
local (r,name) = ranking
println "$/$"(r,name) # 1/first

# Destructuring assignment into existing variables
(r,name) = other_ranking