# uuid/nil Return the nil UUID — the all-zero sentinel defined by RFC 4122, used to represent "no UUID" in the same way `nil` represents "no value". ## Syntax

[uuid/nil]

## Examples

[uuid/nil]    # "00000000-0000-0000-0000-000000000000"

if ($id == [uuid/nil]) { set id [uuid/v4] }

## Returns The constant string `00000000-0000-0000-0000-000000000000`. ## See Also `uuid/v4`, `uuid/v7`, `uuid/valid?`