Add Terraform "for_each patterns" note

Makefile

@@ -2,7 +2,7 @@ build:
 	hugo --buildDrafts --buildFuture --gc --minify --enableGitInfo
 
 serve:
-	hugo serve --buildDrafts --buildFuture --gc --enableGitInfo --ignoreCache --debug --disableFastRender
+	hugo serve --buildDrafts --buildFuture --gc --enableGitInfo --ignoreCache --disableFastRender
 
 clean:
 	rm -rf public/

content/til/arch/custom-repository.md

@@ -1,5 +1,5 @@
 ---
-title: "Custom Repository"
+title: "Hosting Custom Repository in S3"
 date: 2023-07-07
 lastmod: 2023-07-07
 draft: false

content/til/terraform/_index.md

@@ -0,0 +1,3 @@
+---
+title: "Terraform"
+---

content/til/terraform/for_each.md

@@ -0,0 +1,81 @@
+---
+title: "for_each Patterns"
+date: 2024-12-08
+lastmod: 2024-12-08
+draft: true
+toc: true
+---
+
+## List of strings
+
+```hcl
+locals {
+  servers = [
+      "vm-1",
+      "vm-2",
+      "vm-3"
+  ]
+}
+
+resource "example" "this" {
+  for_each = toset(local.servers)
+
+  name = each.key
+}
+```
+
+## List of objects
+
+```hcl
+locals {
+  servers = [
+    {
+      name = "vm-1"
+      ip = "10.0.0.5"
+    }
+  ]
+}
+
+resource "example" "this" {
+  for_each = {
+    for i, vm in local.servers : vm.name => vm
+  }
+
+  name = each.value.name
+  ip_address = each.value.ip
+}
+```
+
+## Cartesian product of two lists
+
+```hcl
+locals {
+  domains = [
+    "https://google.com",
+    "https://example.com"
+  ]
+  paths = [
+	"/foo",
+	"/bar",
+	"/bax"
+  ]
+}
+
+resource "example" "this" {
+  urls = [for url in setproduct(locals.domains, locals.paths) : join("", url)]
+}
+```
+
+## Conditional
+
+```hcl
+resource "example" "this" {
+  for_each   = var.create_example ? [] : [1]
+  name       = ...
+  ip_address = ...
+}
+```
+
+## References
+- [How to for_each through list of objects in
+  Terraform](https://stackoverflow.com/questions/58594506/how-to-for-each-through-a-listobjects-in-terraform-0-12)