= Chapter 5: Terraform tips and tricks
== loops
=== count
    * usage:<code properties>resource "blablabla" "blablabla_name" {
count = 3
name  = "bla${count.index}"
}</code>
    * 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)
  name  = bla_names[count.index]
}</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
    * lists (using **toset()** function), sets and maps
    * 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