[Rd] standardization of slot access
Roger D. Peng
rdpeng at gmail.com
Tue Sep 26 23:56:19 CEST 2006
I think slot() is only necessary in the case where you have
a <- "myslot"
which is equivalent to
object at myslot
It seems unlikely that you would use slot() during interactive use, but perhaps
more so in programming. Even still, I rather infrequently find the need for
slot() because classes have defined slot names---if you're going to access a
slot, just use the name that you gave it in the class definition since that
doesn't change from instance to instance.
Sebastian P. Luque wrote:
> I'm usually confused about when to use 'slot' or '@'. I've frequently
> read that it's always preferable to use accessor functions, so I would
> think the '@' operator should be avoided. However, ?slot contains the
> following advise:
> "Generally, the only reason to use the functional form rather than the
> simpler operator is _because_ the slot name has to be computed."
> How do we decide whether to use the function or the operator?
Roger D. Peng | http://www.biostat.jhsph.edu/~rpeng/
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