fold

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

Fold an Either into a single value by providing functions for both Left and Right cases, along with an initial value.

@example

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

const foldResult = E.fold(
  (acc: string, value: number) => `${acc}, ${value}`,
  "Values:"
);

const result1 = foldResult(E.right(42));
// "Values:, 42"

const result2 = foldResult(E.left("error"));
// "Values:"

function fold<A, O>(foao: (o: O, a: A) => O, o: O): <B>(ta: Either<B, A>) => O;

fold<A, O>(foao: (o: O, a: A) => O, o: O): <B>(ta: Either<B, A>) => O

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§Type Parameters

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§Parameters

foao: (o: O, a: A) => O

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o: O

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§Return Type

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

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