unset

1
version: 1.0.0
2
sections:
3
  main:
4
    - set:
5
        num_var: 1
6
    - play:
7
        url: 'say: The value of num_var is: ${num_var}.'
8
    - unset: num_var
9
    - play:
10
        url: 'say: The value of num_var is ${num_var}.'

1
version: 1.0.0
2
sections:
3
  main:
4
    - set:
5
        systems:
6
          hr:
7
            - tracy
8
            - luke
9
          engineering:
10
            john: absent
11
        name: john
12
    - play:
13
        url: 'say: ${systems.hr}'
14
    - unset:
15
        - systems
16
        - name
17
    # this play statement emits an error because `systems` is undefined
18
    # at this point so there's nothing for `play` to say.
19
    - play:
20
        url: 'say: ${systems}'