gistfile1.lua

template = "$do_cards[[$rank of $suit, ]]"
view = { 
  { rank = "Ace", suit = "Spades" }, 
  { rank = "10", suit = "Hearts" }, 
}
result   = cosmo.fill(template, {
  do_cards = function()
    for i,v in ipairs(view) do
      cosmo.yield(v)
    end
  end
})
print(result) -- Ace of Spades, 10 of Hearts,