advent_1.pp

[ 1000, 2000, 3000, "", 4000, "", 5000, 6000, "", 7000, 8000, 9000, "", 10000, 
].reduce([0]) |$memo, $v| { if $v == "" { $memo << 0 } else { $memo[0,-2] << $memo[-1]+$v } }
.map()  |$i,$x| { [$i,$x] }
.sort() |$a,$b| { compare($b[1], $a[1]) }
.then() |$x| { $x[0] }
.then() |$x| { "Elf ${x[0]} has ${x[1]} calories" }
.notice()
 

output

puppet apply advent.pp
Notice: Scope(Class[main]): Elf 3 has 24000 calories