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Module

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

Rimbu is a TypeScript library focused on immutable, performant, and type-safe collections and other tools.
rimbu-org/rimbu
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variable Reducer.first
import { Reducer } from "https://deno.land/x/rimbu@0.13.1/core/mod.ts";
const { first } = Reducer;

Returns a Reducer that remembers the first input value.

Examples

Example 1

console.log(Stream.range{ amount: 10 }).reduce(Reducer.first())
// => 0

type

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