@angular/forms/signals

reducedMetadataKey

function

Creates an AggregateMetadataKey that reduces its individual values into an accumulated value using the given reduce and getInitial functions.

API

function reducedMetadataKey<TAcc, TItem>(
  reduce: (acc: TAcc, item: TItem) => TAcc,
  getInitial: () => TAcc,
): AggregateMetadataKey<TAcc, TItem>;

AggregateMetadataKey<TAcc, TItem>

Creates an AggregateMetadataKey that reduces its individual values into an accumulated value using the given reduce and getInitial functions.

@paramreduce(acc: TAcc, item: TItem) => TAcc

The reducer function.

@paramgetInitial() => TAcc

A function that gets the initial value for the reduce operation.

@returnsAggregateMetadataKey<TAcc, TItem>