flatmap

import { flatmap } from "https://raw.githubusercontent.com/baetheus/fun/main/option.ts";

Apply a function (a: A) => Option to the wrapped value of an Option if the wrapped value exists, flattening the application result into an Option. This is the equivalent of first mapping from Option to Option<Option> and then calling join to flatten the Options.

@example

import * as O from "./option.ts";
import { pipe } from "./fn.ts";

const result = pipe(
  O.some(1),
  O.flatmap(n => n > 0 ? O.some(n) : O.none),
); // Some(1)

function flatmap<A, I>(fati: (a: A) => Option): (ta: Option<A>) => Option;

flatmap<A, I>(fati: (a: A) => Option): (ta: Option<A>) => Option

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§Type Parameters

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§Parameters

fati: (a: A) => Option

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§Return Type

(ta: Option<A>) => Option

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