InDots: Is a Specific Argument in the Dots-Arguments?
Description
Returns the value of a specific named argument if it was comprised in the dots or a default value, if it wasn't.
Usage
InDots(..., arg, default)
Arguments
…
the dots arguments to be checked.
arg
the name of argument to test for.
default
the default value to return, if the argument arg does not exist in the dots.
Value
the value of the argument, if it exists else the specified default value.