# Pure OwnValue Functions vs Patterned DownValue Functions [duplicate]

Is it better to use pure Function assigned to symbols as their OwnValues vs function defined by patterns as symbol's DownValues.
• Pure functions are often a bit faster, but defining functions by patterns as DownValues is more flexible. For example, this allows for overloading of functions and in combination with TagSetDelayed, you an implement your own "classes" (in the sense of object oriented programming). – Henrik Schumacher Jun 13 '18 at 22:23