is.function {base}

R Documentation

Is an Object of Type (Primitive) Function?

Description

Checks whether its argument is a (primitive) function.

Usage

is.function(x)
is.primitive(x)

Arguments

x	an R object.

Details

is.primitive(x) tests if x is a primitive function, i.e, if typeof(x) is either "builtin" or "special".

Value

TRUE if x is a (primitive) function, and FALSE otherwise.

Examples

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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