parsing html page.swift

import Foundation
import RxCocoa
import RxSwift
import SwiftSoup

struct Post {
    let id: String
}

class Test {
    func posts(in page: Single<Document>) -> Single<[Post]> {
        let elementToPost: (Element) -> Post? = { element in
            guard let id = try? element.attr("id") else {
                return nil
            }

            return Post(id: id)
        }

        return page
            .map { try $0.select("table#the_table div").array() }
            .map { $0.compactMap(elementToPost) }
    }
}