is.function | R Documentation |
Checks whether its argument is a (primitive) function.
is.function(x) is.primitive(x)
x |
an R object. |
is.primitive(x)
tests if x
is a primitive function,
i.e, if typeof(x)
is either "builtin"
or
"special"
.
TRUE
if x
is a (primitive) function, and FALSE
otherwise.
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*
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