如何在Vapor 4中按数组过滤？

import Vapor

struct UserController: RouteCollection {
    func boot(routes: RoutesBuilder) throws {
        let usersRoute = routes.grouped("users")
        usersRoute.get(use: getAllUsers)
        usersRoute.get(":id", use: getUserByID)
    }

    func getAllUsers(req: Request) throws -> EventLoopFuture<[User]> {
        let users = ["John", "Jane", "Bob", "Alice"]
        let filteredUsers = users.filter { $0.hasPrefix("J") } // 过滤以J开头的用户
        return req.eventLoop.makeSucceededFuture(filteredUsers)
    }

    func getUserByID(req: Request) throws -> EventLoopFuture<User> {
        // 获取指定ID的用户
        // ...
    }
}

struct User: Content {
    let name: String
}