> Or, you actually have to use nested arrays to describe that the result might be an error or an array. But now you have to deal with an array which might contain... zero errors or even multiple ones.
In other words: now you have Array<Array<?>>
And now it is only convention that the outer array must only have 0 or 1 elements. But there is no guarantee and the compiler won't help you since it cannot know. That's why this is the inferior approach compared to turning it around and making it so that null can be mapped and flattened.
> Or, you actually have to use nested arrays to describe that the result might be an error or an array. But now you have to deal with an array which might contain... zero errors or even multiple ones.
In other words: now you have Array<Array<?>>
And now it is only convention that the outer array must only have 0 or 1 elements. But there is no guarantee and the compiler won't help you since it cannot know. That's why this is the inferior approach compared to turning it around and making it so that null can be mapped and flattened.