option-t/esm/undefinable/ok_or_else.js

A toolkit of Nullable/Option/Result type implementation in ECMAScript. Their APIs are inspired by Rust's `Option<T>` and `Result<T, E>`.

import { createErr, createOk } from '../plain_result/result.js';
import { isNotUndefined } from './undefinable.js';
/**
 * Transforms the `Undefinable<T>` into a `Result<T, E>` by mapping `T` to `Ok(T)`.
 * If `input` is `undefined`, then returns `Err(E)` with the result of `recoverer()`
 */
export function okOrElseForUndefinable(input, recoverer) {
    if (isNotUndefined(input)) {
        const okWrapped = createOk(input);
        return okWrapped;
    }
    const fallback = recoverer();
    const errWrapped = createErr(fallback);
    return errWrapped;
}