effect-io-ai

Package: effect
Module: Result

Result.mapBoth

Transforms both the success and failure channels of a Result.

When to use

Use to transform both success and failure values without changing whether the result succeeds or fails.

Details

• Applies onSuccess if the result is a Success
• Applies onFailure if the result is a Failure

Example (Mapping both channels)

import { pipe, Result } from "effect"

const result = pipe(
  Result.succeed(1),
  Result.mapBoth({
    onSuccess: (n) => n + 1,
    onFailure: (e) => `Error: ${e}`
  })
)
console.log(result)
// Output: { _tag: "Success", success: 2, ... }

See

• map to transform only the success value
• mapError to transform only the error value
• match to fold into a single value

Signature

declare const mapBoth: { <E, E2, A, A2>(options: { readonly onFailure: (left: E) => E2; readonly onSuccess: (right: A) => A2; }): (self: Result<A, E>) => Result<A2, E2>; <E, A, E2, A2>(self: Result<A, E>, options: { readonly onFailure: (left: E) => E2; readonly onSuccess: (right: A) => A2; }): Result<A2, E2>; }

Source

Since v2.0.0