[R] test to see if a s4 property is assigned?

[darckeen]

>
setClass("person",representation(name="character",age="numeric",kids="list"))
[1] "person"
> bob <- new("person")
> length(bob at name)
[1] 0
> length(bob at age)
[1] 0
> length(bob at kids)
[1] 0
> is.na(bob at kids)
logical(0)
> is.na(bob at age)
logical(0)
> is.na(bob at name)
logical(0)
> bob at kids <- list("joe","sue")
> is.na(bob at kids)
[1] FALSE FALSE
> length(bob at kids)
[1] 2

Ah, length(object at property) is what i was looking for.  Thanks alot.
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