option-t/esm/deprecated/plain_option/map_or_async.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 { isNone, unwrapSome } from './option.js';
/**
 *  Return the result of _transformer_ with using _input_ as an argument for it if _input_ is `Some(T)`.
 *  Otherwise, return _defaultValue_.
 *
 *  Basically, this operation is a combination `map()` and `unwrapOr()`.
 */
export async function mapOrAsyncForOption(input, defaultValue, transformer) {
    if (isNone(input)) {
        return defaultValue;
    }
    const inner = unwrapSome(input);
    const result = await transformer(inner);
    return result;
}