effect-io-ai

Package: effect
Module: Effect

Effect.mapBoth

Applies transformations to both the success and error channels of an effect.

Details

This function takes two map functions as arguments: one for the error channel and one for the success channel. You can use it when you want to modify both the error and the success values without altering the overall success or failure status of the effect.

Example

import { Effect } from "effect"

//      ┌─── Effect<number, string, never>
//      ▼
const simulatedTask = Effect.fail("Oh no!").pipe(Effect.as(1))

//      ┌─── Effect<boolean, Error, never>
//      ▼
const modified = Effect.mapBoth(simulatedTask, {
  onFailure: (message) => new Error(message),
  onSuccess: (n) => n > 0
})

See

• map for a version that operates on the success channel.
• mapError for a version that operates on the error channel.

Signature

declare const mapBoth: { <E, E2, A, A2>(options: { readonly onFailure: (e: E) => E2; readonly onSuccess: (a: A) => A2; }): <R>(self: Effect<A, E, R>) => Effect<A2, E2, R>; <A, E, R, E2, A2>(self: Effect<A, E, R>, options: { readonly onFailure: (e: E) => E2; readonly onSuccess: (a: A) => A2; }): Effect<A2, E2, R>; }

Source

Since v2.0.0