idLeft

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

Perform the same function as Reader askLeft. Given a type B (and optionally a type A), return a FnEither<[B], B, A>. This is useful for starting a FnEither flatmap with a left value.

@example

import * as FE from "./fn_either.ts";
import { pipe } from "./fn.ts";

const computation = FE.idLeft<number>();

const result1 = computation(1); // Left(1);
const result2 = computation(2); // Left(2);

function idLeft<B, A = never>(): FnEither<B, B, A>;

idLeft<B, A = never>(): FnEither<B, B, A>

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§Type Parameters

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A = never

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§Return Type

FnEither<B, B, A>

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