nest

dictionary →
nest() → dictionary

Restructures a dictionary with tuple keys into nested dictionaries, one level per tuple position, preserving key types and source insertion order.

Parameters

This function has no parameters.

Argument evaluation

Visits each entry of the dictionary supplied as pipeline input to this nest call in insertion order, using its tuple key positions to form nested dictionary levels.

Behavior

An empty dictionary remains empty. Every key in a nonempty dictionary must be a tuple of the same arity, at least two; other keys cause an evaluation error. Each tuple’s last position maps to its original value. Keys at every level use dictionary structural equality.

Examples

!{(T("BE", 2025) => 100), (T("BE", 2026) => 120), (T("FR", 2025) => 80)} | nest → !{("BE" => !{(2025 => 100), (2026 => 120)}), ("FR" => !{(2025 => 80)})}

Kind: Function
Scope: dictionary
Aliases: None