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Terraform: From Beginner to Master with Examples in AWS

Type Constraints - Set

Explore how Terraform uses set type constraints to manage unique values within variables. Learn to define sets, understand differences from lists, and convert lists into sets to remove duplicates. This lesson helps you apply sets effectively in your Terraform configurations and optimize variable management.

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Set

A set is almost the same as a list. The key difference is that a set only contains unique values.

C++
variable "my_set" {
    type = set(number)
    default = [7, 2, 2]
}
variable "my_list" {
    type = list(string)
    default = ["foo", "bar", "foo"]
}
output "set" {
    value = var.my_set
}
output "list" {
    value = var.my_list
}
output "list_as_set" {
    value = toset(var.my_list)
}

In the above example, we define a variable called my_set and initialize it to the set [7, 2, 2]. As stated above, a set only contains unique values, so when we ...