alt

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

Provide an alternative Either value if the first one is Left. If the first is Right, it's returned unchanged.

@example

import * as E from "./either.ts";

const result1 = E.alt(E.right("fallback"))(E.left("error"));
// Right("fallback")

const result2 = E.alt(E.right("fallback"))(E.right("original"));
// Right("original")

function alt<A, J>(tb: Either<J, A>): (ta: Either<B, A>) => Either;

alt<A, J>(tb: Either<J, A>): (ta: Either<B, A>) => Either

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§Type Parameters

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§Parameters

tb: Either<J, A>

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§Return Type

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

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