# as_function

From rlang v0.1.1
by Lionel Henry

##### Convert to function or closure

`as_function()`

transform objects to functions. It fetches functions by name if supplied a string or transforms quosures to a proper function.`as_closure()`

first passes its argument to`as_function()`

. If the result is a primitive function, it regularises it to a proper closure (see`is_function()`

about primitive functions).

##### Usage

`as_function(x, env = caller_env())`as_closure(x, env = caller_env())

##### Arguments

- x
A function or formula.

If a

**function**, it is used as is.If a

**formula**, e.g.`~ .x + 2`

, it is converted to a function with two arguments,`.x`

or`.`

and`.y`

. This allows you to create very compact anonymous functions with up to two inputs.- env
Environment in which to fetch the function in case

`x`

is a string.

##### Examples

```
# NOT RUN {
f <- as_function(~ . + 1)
f(10)
# Primitive functions are regularised as closures
as_closure(list)
as_closure("list")
# Operators have `.x` and `.y` as arguments, just like lambda
# functions created with the formula syntax:
as_closure(`+`)
as_closure(`~`)
# }
```

*Documentation reproduced from package rlang, version 0.1.1, License: GPL-3*

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