map

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

Map over the output of a Fn. This is equivalent to function composition. ie. a => pipe(f, map(g))(a) === a => g(f(a))

@example

import { map, wrap, pipe } from "./fn.ts";

const result = pipe(wrap(1), map(n => n + 1)); // 2

function map<A, I>(fai: (a: A) => I): <D>(ta: Fn<D, A>) => Fn<D, I>;

map<A, I>(fai: (a: A) => I): <D>(ta: Fn<D, A>) => Fn<D, I>

fai: (a: A) => I