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--- info:libros:terraform-upandrunning:cap5 [22/05/2020 08:32] – creat mate
+++ info:libros:terraform-upandrunning:cap5 [23/05/2020 15:06] (actual) – [loops] admin
@@ Línia 1: / Línia 1: @@
 = Chapter 5: Terraform tips and tricks
 == loops
-  * ''count''
+=== count
     * usage:<code properties>resource "blablabla" "blablabla_name" {
 count = 3
 name  = "bla${count.index}"
 }</code>
-    * result: 3 elements ([0],[1],[2])
+    * result: 3 elements ([0],[1],[2]) -> resources array
     * with ''length()'':<code properties>
 variable "bla_names" {
   type    = list(string)
   default = ["bla_green","bla_yellow","bla_red"]
+}
 resource "blablabla" "blablabla_name" {
   count = length(var.bla_names)
@@ Línia 16: / Línia 17: @@
 }</code>
     * output
-      * **[#]**
+      * **[#]**: use cardinal to access a concrete element
-      * **[%%*%%]**
+      * **[%%*%%]**: all elements from resource list
     * each element is assigned to their index in state, deletes o modifications implies "move" all elements after that.
     * only usable for **resources**, no inline blocks
-  * ''for_each''
+=== for_each
-  * ''for''
+    * lists (using **toset()** function), sets and maps
-  * ''for string''
+    * for use in **resources** o **inline blocks**
+    * use **each.key** and **each.value**
+    * usage:<code properties>
+variable "bla_names" {
+  type    = list(string)
+  default = ["bla_green","bla_yellow","bla_red"]
+}
+resource "blablabla" "blablabla_name" {
+for_each = toset(var.bla_names)
+name  = each.value
+}</code>
+<code properties>
+variable "bla_names" {
+  type    = map(string)
+  default = {"green" = "bla_green","yellow" = "bla_yellow","red" = "bla_red"}
+  #default = map("green","bla_green", "yellow","bla_yellow", "red","bla_red")
+}
+resource "blablabla" "blablabla_name" {
+for_each = toset(var.bla_names)
+name  = each.value
+}
+</code>
+    * **output**:
+      * ''values(<resource_name>)[*].attribute''
+=== for
+=== for string
 == conditionals
+<callout type="warning" icon="true" title="Pendiente">Pos 3500 aprox</callout>
+=== count
+<code properties>
+variable "booleana" {
+  type = bool
+}
+resource "resource" "resource_name" {
+  count = var.booleana ? 1 : 0
+  ...
+}
+variable "cadena" {
+  type = string
+  default = "aaa"
+}
+resource "resource" "resource_name {
+  count = format("%.1s",var.cadena) == "a" ? 1 : 0
+}
+</code>
+=== for_each
+=== if string
 == Zero-Downtime Deployment
 == terraform gotchas