Reducer.single | /core/mod.ts | rimbu@1.2.0

Module

x/rimbu/core/mod.ts>Reducer.single

Rimbu is a TypeScript library focused on immutable, performant, and type-safe collections and other tools.

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mod.ts (default module)

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variable Reducer.single

import { Reducer } from "https://deno.land/x/rimbu@1.2.0/core/mod.ts";
const { single } = Reducer;

Returns a Reducer that only produces an output value when having receives exactly one input value, otherwise will return the otherwise value or undefined.

type

{ <T>(): Reducer<T, T | undefined>; <T, O>(otherwise: OptLazy<O>): Reducer<T, T | O>; }