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Determine object type.
otype(x)
object to determine type of
Figure out which object system an object belongs to:
base: no class attribute
S3: class attribute, but not S4
S4: isS4, but not RC
isS4
RC: inherits from "refClass"
Other object inspection: ftype(), sexp_type()
ftype()
sexp_type()
otype(data.frame()) otype(1:10)
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