flatmapFirst

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

Chain AsyncEither computations together, but keep the original value if the chain fails.

@example

import * as AE from "./async_either.ts";
import { pipe } from "./fn.ts";

const result = pipe(
  AE.right(5),
  AE.flatmapFirst(n => AE.left("Failed"))
);

const value = await result(); // Left("Failed")

function flatmapFirst<A, I, J>(fati: (a: A) => AsyncEither<J, I>): (ta: AsyncEither<B, A>) => AsyncEither;

flatmapFirst<A, I, J>(fati: (a: A) => AsyncEither<J, I>): (ta: AsyncEither<B, A>) => AsyncEither

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§Type Parameters

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§Parameters

fati: (a: A) => AsyncEither<J, I>

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§Return Type

(ta: AsyncEither<B, A>) => AsyncEither

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