Terraform: From Beginner to Master with Examples in AWS/

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Type Constraints - Simple Types

Type Constraints - Simple Types

This lesson will cover the types of variables used in Terraform.

We'll cover the following...

So far, we have been setting variables and not specified the type. This means that whatever type you pass to a variable will be the type that the variable assumes. A type constraint allows you to be specific about the type of a variable. There are three simple types:

  • string
  • number
  • bool

Project example

To specify a type constraint, use the type property when defining a variable. Let’s see an example of using the three simple types:

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variable "a" {
    type = string
    default = "foo"
}
variable "b" {
    type = bool
    default = true
}
variable "c" {
    type = number
    default = 123
}
output "a" {
    value = var.a
}
output "b" {
    value = var.b
}
output "c" {
    value = var.c
}

In this project, we are defining three variables a, b, and c. We are using the type parameter to define:

  • a as a string,
  • b as a bool, and
  • c as a number.
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