option-t/esm/plain_result/operators/transpose.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 { isNull } from '../../nullable/core/nullable.js';
import { isUndefined } from '../../undefinable/core/undefinable.js';
import { isErr, createOk } from '../core/result.js';
import { unsafeUnwrapValueInOkWithoutAnyCheck } from '../internal/intrinsics_unsafe.js';
/**
 *  Transposes a `Result` of an `Nullable<T>` into an `Nullable<T>` of a `Result`.
 *
 *  - `Ok(T)` -> `Ok(T)`
 *  - `Ok(null)` -> `null`
 *  - `Err(E)` -> `Err(E)`
 */
export function transposeResultToNullable(input) {
    if (isErr(input)) {
        return input;
    }
    const inner = unsafeUnwrapValueInOkWithoutAnyCheck(input);
    if (isNull(inner)) {
        return null;
    }
    return createOk(inner);
}
/**
 *  Transposes a `Result` of an `Undefinable<T>` into an `Undefinable<T>` of a `Result`.
 *
 *  - `Ok(T)` -> `Ok(T)`
 *  - `Ok(undefined)` -> `undefined`
 *  - `Err(E)` -> `Err(E)`
 */
export function transposeResultToUndefinable(input) {
    if (isErr(input)) {
        return input;
    }
    const inner = unsafeUnwrapValueInOkWithoutAnyCheck(input);
    if (isUndefined(inner)) {
        return undefined;
    }
    return createOk(inner);
}