fold

import { fold } from "https://github.gh-proxy.cn/raw.githubusercontent.com/baetheus/fun/main/pair.ts";

Reduces a pair with an initial value, also passing the second value into the foldr as well.

@example

import { pair, fold } from "./pair.ts";
import { pipe } from "./fn.ts";

const result = pipe(
  pair(10, 20),
  fold(Math.max, Number.NEGATIVE_INFINITY),
); // 20

function fold<A, B, O>(foao: (

acc: O,

first: A,

second: B,

) => O, initial: O): (ua: Pair<A, B>) => O;

fold<A, B, O>(foao: (acc: O, first: A, second: B) => O, initial: O): (ua: Pair<A, B>) => O

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§Type Parameters

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§Parameters

foao: (acc: O, first: A, second: B) => O

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initial: O

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§Return Type

(ua: Pair<A, B>) => O

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