# alist() Function in R (2 Examples)

In this article, I’ll illustrate how to create an alist object using the alist() function in the R programming language.

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Let’s jump right to the examples!

## Example 1: Construct List of Function Arguments Using alist()

The following R programming code explains how to create a list of function arguments using the alist function in R.

Consider the R syntax below:

```my_alist <- alist(x = , y = 5, x^2 + y)    # Create alist object
my_alist                                   # Print alist object
# \$x
#
#
# \$y
#  5
#
# []
# x^2 + y```

As you can see based on the previous output, we have created a list containing three elements. The first list element contains the x argument, the second list element contains the y argument and its default value (i.e. 5), and the third list element contains the function body.

## Example 2: Convert alist() Output to User-Defined Function

In this example, I’ll illustrate how to convert a list created by the alist command to a user-defined function.

For this task, we can apply the as.function function as shown below:

```my_fun <- as.function(my_alist)            # Convert alist object to function
my_fun                                     # Print user-defined function
# function (x, y = 5)
# x^2 + y
# <environment: 0x55832aa301c8>```

The previous output shows the structure of our new function called my_fun.

Let’s apply this function to a certain x-value (i.e. 2):

```my_fun(x = 2)                              # Apply user-defined function
#  9```

The result of our user-defined function is 9.

## Video, Further Resources & Summary

Have a look at the following video on my YouTube channel. In the video, I’m explaining the content of this tutorial:

Furthermore, you could have a look at some of the related articles on this homepage. I have released several articles already:

To summarize: At this point you should know how to use the alist() function in the R programming language. If you have further questions, let me know in the comments section. Furthermore, don’t forget to subscribe to my email newsletter to get updates on the newest articles.

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