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

[darckeen]

Class("person",representation(age="numeric",weight="numeric"))
[1] "person"
> bob <- new("person",age=30)
> is.null(bob at weight)
[1] FALSE
> bob at weight
numeric(0)
> bob at weight == numeric(0)
logical(0)

How can i test to see if a s4 property is assigned?

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