CommonizedDataSource#intro.swift

class CommonizedDataSource: NSObject, UITableViewDataSource {

    private var values: [(headerTitle: String?, rows: [(value: Any, reusableId: String)])] = []

    func load(_ tasks: [Task]) {
        self.values = [
            (
                headerTitle: nil,
                rows: [(value: (), reusableId: "ProfileTableViewCell")]
            ),
            (
                headerTitle: Category.personal.rawValue,
                rows: tasks.filter { $0.category == .personal }.map { (value: $0, reusableId: "TaskTableViewCell") }
            ),
            (
                headerTitle: Category.shopping.rawValue,
                rows: tasks.filter { $0.category == .personal }.map { (value: $0, reusableId: "TaskTableViewCell") }
            ),
            (
                headerTitle: Category.work.rawValue,
                rows: tasks.filter { $0.category == .personal }.map { (value: $0, reusableId: "TaskTableViewCell") }
            )
        ] as! [(headerTitle: String?, rows: [(value: Any, reusableId: String)])]
    }
                    .
                    .
                    .