# is.function

##### 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,
i.e, if `typeof(x)`

is either `"builtin"`

or
`"special"`

.

##### Value

`TRUE`

if `x`

is a (primitive) function, and `FALSE`

otherwise.

##### Examples

`library(base)`

```
# NOT RUN {
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*
# }
```

*Documentation reproduced from package base, version 3.6.1, License: Part of R 3.6.1*

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