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Module

x/result_js/mod.ts>mapOrElse

Minimum result type port of Rust
TomokiMiyauci/result
Latest
function mapOrElse
import { mapOrElse } from "https://deno.land/x/result_js@2.0.0/mod.ts";

Maps a Result<T, | E> to U by applying defaultFn to a contained Err, or fn to a contained Ok.

Examples

Example 1

import { Ok, type Result } from "https://deno.land/x/result_js/spec.ts";
import { mapOrElse } from "https://deno.land/x/result_js/operators/transform.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";

const result: Result<string, string> = Ok("Hello");
assertEquals(mapOrElse(result, () => 2 ** 3, ({ length }) => length), 5);

Parameters

result: Result<T, E>
defaultFn: (value: E) => U
fn: (value: T) => U