Value or Reference Semantics for Arrays?

gistfile1.swift

// Non-Working Code
                if var monthArray = self.orderHistory[monthStr] {
                    monthArray.append(anOrder)
                } else {
                    var monthArray = [HLOOrder]()
                    self.orderHistory[monthStr] = monthArray
                    monthArray.append(anOrder)
                }


// Working Code
                if var monthArray = self.orderHistory[monthStr] {
                    monthArray.append(anOrder)
                    self.orderHistory[monthStr] = monthArray
                } else {
                    var monthArray = [HLOOrder]()
                    monthArray.append(anOrder)
                    self.orderHistory[monthStr] = monthArray
                }