effect-io-ai

Package: effect
Module: Tuple

Tuple.makeReducer

Creates a Reducer for a tuple shape by providing a Reducer for each position. The initial value is derived from each position’s Reducer.initialValue. When reducing a collection of tuples, each element is combined independently.

When to use

Use when you need to fold same-shape tuples by accumulating each position independently into one summary tuple.

Example (Reducing a collection of tuples)

import { Number, String, Tuple } from "effect"

const R = Tuple.makeReducer<readonly [number, string]>([
  Number.ReducerSum,
  String.ReducerConcat
])

const result = R.combineAll([
  [1, "a"],
  [2, "b"],
  [3, "c"]
])
console.log(result) // [6, "abc"]

See

• makeCombiner – like makeReducer but without an initial value

Signature

declare const makeReducer: <A extends ReadonlyArray<unknown>>(reducers: { readonly [K in keyof A]: Reducer.Reducer<A[K]>; }) => Reducer.Reducer<A>

Source

Since v4.0.0