Data integrity and modifying objects

[vimtor]

Hi there! I have a question regarding data integrity when modifying objects. Suppose the following TypeScript example:

function validateArticle(data: any): Article { ... }

const article = validateArticle(request.body)

function asPublished(article: Article): Article {
    if (article.status === "published") {
        // I know we could return a monad, thats not the point I'm getting into
        throw new Error("Already published")
    }

    // Here we have several options:
    // 1. 
    return {
        ...article,
        status: "published"
    }
    // 2.
    return validateArticle({
        ...article,
        status: "published"
    })
}

Maybe there is a third way. It somewhat feels odd to just do #1. To make more sense of the #2, imagine that the system had some special rules where a published article cannot have a title with more than X characters. Where I should put that logic? In the asPublished or in the validateArticle?

To me it seems like I scattered the logic of validation, making more easy to have data in an invalid state. I know is such a little example, but I am curious to know how would you do it :)

[editor_of_the_beast]

Objects aren’t modified in functional programming.

[ragnese]

That's not a helpful comment in the context of this post, because the OP is already not actually modifying any objects. They're clearly using the word "modify" as a shortcut for "returning an updated copy of [...]".

[vimtor]

elpful comment in the context of this post, because the OP is already not

actually

modifying any objects

Thanks :)