Iterator variable in Terraform - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define an iterator variable in a Terraform for expression.

Terraform

locals {
  names = ["app", "db", "cache"]
  upper_names = [for [1] in local.names : upper([1])]
}

Drag options to blanks, or click blank then click option'

Aitem

Bvalue

Cname

Delement

Attempts:

3 left

💡 Hint

Common Mistakes

Using reserved keywords like 'value' or 'element' as iterator variable names.

Not using the same iterator variable name consistently inside the for expression.

The iterator variable in a Terraform for expression is a placeholder for each element in the list. Here, item is used as the iterator variable.

2fill in blank

medium

Complete the code to create a map using an iterator variable in Terraform.

Terraform

locals {
  ports = [80, 443, 8080]
  port_map = { for [1] in local.ports : [1] => "open" }
}

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Aitem

Bport

Cvalue

Dp

Attempts:

3 left

💡 Hint

Common Mistakes

Using a generic name like 'value' which can be confusing.

Using different variable names in the key and value parts.

The iterator variable port is used to represent each element in the list local.ports. It is used both as the key and in the expression.

3fill in blank

hard

Fix the error in the iterator variable usage in this Terraform for expression.

Terraform

locals {
  servers = ["web1", "web2"]
  server_ids = [for [1] in local.servers : "id_${server}" ]
}

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Ainstance

Bsrv

Cserver

Dservers

Attempts:

3 left

💡 Hint

Common Mistakes

Using the plural form 'servers' as the iterator variable but referencing 'server' inside the expression.

Using a different variable name inside the expression than the iterator variable.

The iterator variable must match the variable used inside the expression. Here, server is the correct iterator variable name.

4fill in blank

hard

Fill both blanks to create a map of server names to their uppercase versions using iterator variables.

Terraform

locals {
  servers = ["app", "db", "cache"]
  upper_map = { for [1] in local.servers : [2] => upper([2]) }
}

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Asrv

Bserver

Cs

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names in the key and value parts.

Using a variable name that is not defined as the iterator.

The iterator variable server is used consistently as the key and inside the upper() function.

5fill in blank

hard

Fill all three blanks to create a list of strings combining iterator variable and index in Terraform.

Terraform

locals {
  names = ["alpha", "beta", "gamma"]
  combined = [for [2], [1] in local.names : "$[1]_$[2]"]
}

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Aname

Bidx

Ci

Dindex

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the order of iterator variables.

Using different variable names inside the string than declared.

The iterator variables are name and idx. The string combines the name and index using idx.