mergeSecond

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

Apply a function in the first position of a pair to a value in the second position of a pair.

@example

import * as P from "./pair.ts";
import { flow } from "./fn.ts";

const double = flow(
  P.dup<number>,
  P.mapSecond(n => (m: number) => n + m),
  P.mergeSecond,
);

const result1 = double(1); // 2
const result2 = double(2); // 4

function mergeSecond<A, I>(ua: Pair<A, (a: A) => I>): I;

mergeSecond<A, I>(ua: Pair<A, (a: A) => I>): I

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§Type Parameters

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§Parameters

ua: Pair<A, (a: A) => I>

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§Return Type

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