In Ansible, how to combine variables from separate files into one array?

Question

In Ansible, in a role, I have vars files like this:

vars/
    app1.yml
    app2.yml

Each file contains vars specific to an app/website like

Answer 1

Starting with Ansible v2.0 you can do it:

- name: merging hash_a and hash_b into hash_c
  set_fact: hash_c="{{ hash_a|combine(hash_b) }}"

Check more under Ansible filters - Combining hashes/dictionaries (coming from Jinja2)