terraform-training/project2/base.tf

variable "a" {}
variable "b" {
  default = "test"
}
variable "c" {
  type = list
  default = ["foo", "bar", "baz"]
}
variable "d" {
  type = map
  default = {
    "foo" = "bar"
    "aze" = "rty"
    "qsd" = "fgh"
  }
}

output "ov1" {
  value = "${var.a}"
}
output "ov2" {
  value = "${var.b}"
}
output "ov3" {
  value = "${var.c[2]}"
}
output "ov4" {
  value = "${var.d.foo}"
}