is.function
From base v3.3
by Rcore Rcore@Rproject.org
Is an Object of Type (Primitive) Function?
Checks whether its argument is a (primitive) function.
 Keywords
 programming
Usage
is.function(x)
is.primitive(x)
Arguments
 x
 an R object.
Details
is.primitive(x)
tests if x
is a primitive function
(either a "builtin"
or "special"
as described for
typeof
)? It is a primitive function.
Value

TRUE if x is a (primitive) function, and FALSE
otherwise.
Examples
library(base)
is.function(1) # FALSE
is.function(is.primitive) # TRUE: it is a function, but ..
is.primitive(is.primitive) # FALSE:it's not a primitive one, whereas
is.primitive(is.function) # TRUE: that one *is*
Community examples
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