unwrapOrElse

unwrapOrElse returns the success value, or maps the error into a fallback value.

import {err} from 'unwrapit'

const value = err<string, number>('error').unwrapOrElse(error => error.length)

value // 5

Signature:

unwrapOrElse<U>(mapFn: (error: E) => U): T | U

Use unwrapOrElse when the fallback depends on the error or is expensive to create.