default

To set a simple default value, use default:

default "foo" .Bar

In the above, if .Bar evaluates to a non-empty value, it will be used. But if it is empty, foo will be returned instead.

The definition of "empty" depends on type:

• Numeric: 0
• String: ""
• Lists: []
• Dicts: {}
• Boolean: false
• And always nil (aka null)

For structs, there is no definition of empty, so a struct will never return the default.