sirh3e/Rust

namespace Sirh3e.Rust.Result;

public readonly partial struct Result<TOk, TErr>
{
    /// <summary>
    /// Maps a Result&lt;TOk, TErr&gt; to T by applying a function to a contained Ok value, or a fallback function to a contained Err value.
    /// This function can be used to unpack a successful result while handling an error.
    /// </summary>
    /// <param name="default"></param>
    /// <param name="map"></param>
    /// <typeparam name="T"></typeparam>
    /// <returns></returns>
    /// <exception cref="ArgumentNullException"></exception>
    public T MapOrElse<T>(Func<TErr, T> @default, Func<TOk, T> map)
        => Match(ok =>
                     (_ = map ?? throw new ArgumentNullException(nameof(map)))(ok),
                 err => (_ = @default ?? throw new ArgumentNullException(nameof(@default)))(err)
                );
}