flatmap

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

Create a new Fn by combining A => L => I with D => A to produce D & L => I. This is equivalent to ap with the first two arguments switched. It is also limited to unary functions in order to properly handle type widening on the input type.

@example

import { pipe, flatmap } from "./fn.ts";
const add = (n: number) => (m: number) => n + m;

const flatmaper = pipe(
  (n: number) => n,
  flatmap(add),
  flatmap(add),
  flatmap(add),
  flatmap(add),
  flatmap(add),
);

const result1 = flatmaper(1); // 6
const result2 = flatmaper(2); // 12
const result3 = flatmaper(3); // 18

function flatmap<A, I, L>(fati: (a: A) => Fn<L, I>): <D>(ta: Fn<D, A>) => Fn<D & L, I>;

flatmap<A, I, L>(fati: (a: A) => Fn<L, I>): <D>(ta: Fn<D, A>) => Fn<D & L, I>

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§Type Parameters

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§Parameters

fati: (a: A) => Fn<L, I>

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§Return Type

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