put-absent-path

record →
put-absent-path(
    path: expression,
    value: expression
) → record

Assigns the field at a dynamic path only when the final segment is absent, creating missing intermediate records.

Parameters

Name	Type	Required	Description
`path`	`expression`	Yes	An expression producing non-empty text for one literal segment or a non-empty tuple of non-empty text segments.
`value`	`expression`	Yes	The expression producing the assigned value from the original input record.

path: Evaluated once against the value entering this call.
value: Evaluated against the original incoming record only if the target path is absent.

{name := "Alice"} | put-absent-path(T("details", "age"), 42) → {name := "Alice", details := {age := 42}}

Kind: Function
Scope: record
Aliases: None