Check if the given object is a nugget, i.e. an object created by
nugget(). If a flavour is specified, the function returns TRUE only
if the object is a nugget of the given flavour.
Value
A logical scalar: TRUE if x is a nugget (and of the specified
flavour, if given), otherwise FALSE.
Details
Technically, nuggets are implemented as S3 objects. An object is considered
a nugget if it inherits from the S3 class "nugget". It is a nugget of a
given flavour if it inherits from both the specified flavour class and
the "nugget" class.
