functionalRefactor.swift

// Original implementation with multiple returns:

class func fromId(id: String) -> Office? {
   let officesData = JSONData.load("offices") as? [[String: String]] ?? []
   let officeData = officesData.filter { $0["id"] == id }.first
   
   if let office = officeData {
      return decode(JSONValue.parse(office))
   }
   
   return .None
}

// Refactored using functional concepts, removing the need for multiple returns

class func fromId(id: String) -> Office? {
   let officesData = JSONData.load("offices") as? [[String: String]] ?? []
   let officeData = officesData.filter { $0["id"] == id }.first
   return (JSONValue.parse <^> officeData) >>- decode
}