UITableViewDelegate vs RxCocoa. Rx framework can be found here - https://github.com/RxSwiftCommunity/RxDataSources

UITableViewDelegate_vs_RxDataSource.swift

// Native way
var sections = [["Section 1": [1, 2, 3]],
                ["Section 2": [4, 5, 6]]]

func numberOfSections(in tableView: UITableView) -> Int {
    return sections.count
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return sections[section].count
}
    
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
    return sections[section]
}
    
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
    let item = numbers[indexPath.section][indexPath.row]
    cell.textLabel?.text = item
    return cell
}

// new value
sections = [...]
tableView.reloadData() // no diff comuptation
//____________________//

// RxDataSource
let sections = BehaviorRelay<[SectionModel<String, Int>]>(value:
    [SectionModel(model: "Section 1", items: [1, 2, 3]),
     SectionModel(model: "Section 2", items: [4, 5, 6])]
)

let dataSource = RxTableViewSectionedReloadDataSource<SectionModel<String, Int>>(
    configureCell: { [unowned self] _, tableView, indexPath, item in
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
        cell.textLabel?.text = item
        return cell
    },
    titleForHeaderInSection: { dataSource, sectionIndex in dataSource[sectionIndex].model }
)

sections.asDriver()
    .drive(tableView.rx.items(dataSource: dataSource))
    .disposed(by: disposeBag)

// new value
sections.accept([...]) // and here you have diff computation and reloading of only needed cells