Test whether an object is a nugget

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.

Usage

is_nugget(x, flavour = NULL)

Arguments

x

An object to be tested.

flavour

Optional character string specifying the required flavour of the nugget. If NULL (default), the function checks only whether x is a nugget of any 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.

See also

nugget()

Author

Michal Burda