Type Constraints - Set

Set#

A set is almost the same as a list. The key difference is that a set only contains unique values.

In the above example, we define a variable called my_set and initialize it to the set [7, 2, 2]. As stated above, a set only contains unique values, so when we run this project we will define/specify that the output value set will print [7, 2]. Terraform removes one of the 2 values as it was a duplicate.

To show how sets can be useful, we define a list called my_list to repeat the value foo twice. The value of the list output will be ["foo", "bar", "foo"] because we are outputting the value of my_list, which is of type list and lists can contain duplicate values.

For the output list_as_set, we are using the toset function to convert the my_list variable to a set. The value of this output will be ["foo", "bar"]. Because we are converting the list to a set, Terraform removes the duplicate value "foo".

Running the project#

Clicking the terminal will run terraform init and terraform apply commands. When prompted, type yes and press enter.

📝Note: Once you are done with the project, do not forget to run terraform destroy and then confirm with yes to delete all of the resources in this project.