Terraform Variables

Variable Types

1. List

variable "mylist" {
  type = list
  default = ["apple", "banana", "carrot"]
}

• Extracting an element from a list

var.mylist[0] # Zero is the index number

OR

element(mylist, 0)

2. Nested List

variable "mynestedlist" {
  type = list
  default = [
    ["apple", "banana", "carrot"], 
    ["dog", "elephant", "frog"]
    ]
}

• Output the Flatten or merged nested list

output "flat_list" {
  value = flatten(var.mynestedlist)
}

# This will result to 

["apple", "banana", "carrot", "dog", "elephant", "frog"]

3. Map

variable "countries_map" {
  default = {
    ph = "Philippines"
    sg = "Singapore"
    us = "United States"
  }
}

• Output and extracting Map

output "country" {
  value = lookup(var.country_map, "ph")
}

4. Strings

variable "mystring" {
  type = string
  default = "This is a string"
}