Utilize list comprehension to output EC2 ARNs.

terraform/data.tf

@@ -5,7 +5,7 @@
 
 #   filter {
 #     name   = "name"
-#     values = var.compute_ami
+#     values = ["amazon linux"]
 #   }
 
 #   filter {
@@ -18,3 +18,6 @@
 #     values = ["x86_64"]
 #   }
 # }
+
+# data "" "ec2_arns" {
+# }

terraform/main.tf

@@ -1,4 +1,5 @@
 terraform {
+  required_version = ">= 0.13.1"
   required_providers {
     aws = {
       source  = "hashicorp/aws"

terraform/outputs.tf

@@ -1,9 +1,10 @@
-output "compute_ami" {
-  description = "Prints the image AMI installed on our EC2s."
-  value       = data.aws_ami.compute_ami
-}
+# output "compute_ami" {
+#   description = "Prints the image AMI installed on our EC2s."
+#   value       = data.aws_ami.compute_ami
+# }
 
+# Extract EC2 ARN from each instance, into a new map.
 output "public_ec2" {
-  description = "Prints the ARN for the publicly accessible EC2"
-  value       = module.standalone_ec2.arn
-}
+  description = "Prints the ARN for the publicly accessible EC2(s)"
+  value       = [for idx, val in module.standalone_ec2 : val.arn]
+}