group-by

array →
group-by(
    ...expressions: expression
) → grouping

Groups input values by keys calculated from one or more expressions.

Parameters

Name	Type	Required	Description
`expressions`	`expression`	Variadic (one or more)	One or more expressions evaluated once per input value; multiple results form a tuple key.

Visits each element of the array entering this call.

expressions: Each supplied expression is evaluated once per visited element, with that element as its context.

{"BE", "be", "FR"} | group-by(lower) → #{("be" => {"BE", "be"}), ("fr" => {"FR"})}

Kind: Function
Scope: array/grouping
Aliases: None