String interpolation

String interpolation is the concept of baking other objects (e.g. local values and variables) into a string.

In the following example there is a variable representing a name, and a local value representing the current date. Both the variable and the local value are used to construct an output string using string interpolation:

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variable "name" {
  description = "Name of a person"
  default     = "Jane Doe"
  type        = string
}

locals {
  now = formatdate("YYYY-MM-DD", timestamp())
}

output "string_interpolation" {
  value = "On ${local.now}, ${var.name} said 'Hello!'"
}