Inline module

Because this is Terraform, and it's the ultimate optimisation technique

2024/bonus/day11/step/main.tf

@@ -2,17 +2,24 @@ variable "prev" {
   type = map(number)
 }
 
-module "transform" {
-  source   = "../transform"
-  for_each = var.prev
-
-  num = each.key
-}
-
 locals {
+  not_a_module = {
+    for num, _ in var.prev : num => (
+      tonumber(num) == 0
+      ? [1]
+      : (
+        length(tostring(num)) % 2 == 0
+        ? [
+          tonumber(substr(tostring(num), 0, length(tostring(num)) / 2)),
+          tonumber(substr(tostring(num), length(tostring(num)) / 2, length(tostring(num)) / 2)),
+        ]
+        : [num * 2024]
+      )
+    )
+  }
   by_value = flatten([
-    for key, value in module.transform :
-    [for result in value.result : { num = result, count = var.prev[key] }]
+    for key, value in local.not_a_module :
+    [for result in value : { num = result, count = var.prev[key] }]
   ])
 
   grouped = { for kv in local.by_value : kv.num => kv.count... }

2024/bonus/day11/transform/main.tf

@@ -1,15 +0,0 @@
-variable "num" {
-  type = number
-}
-
-locals {
-  as_str = tostring(var.num)
-  len    = length(local.as_str)
-  half   = floor(length(local.as_str) / 2)
-  first  = try(tonumber(substr(local.as_str, 0, local.half)), -1)
-  second = try(tonumber(substr(local.as_str, local.half, local.half)), -1)
-}
-
-output "result" {
-  value = var.num == 0 ? [1] : local.len % 2 == 0 ? [local.first, local.second] : [var.num * 2024]
-}