sos function การใช้

The constant 1 denotes the absence of any resource, and so functions as the unit of ?".
The differential of a constant function is zero, as noted above, and the differential operator is a linear operator, so functions that only differ by a constant term have the same derivative.
In these cases responsibility-driven design may be promoted as a better approach, where functionality and data can be coupled together, so functions don't have to deal with the data representation itself.