How to add/append an item to a list in R?

R – Add/Append Item to List

To add an item to a list in R programming, call append() function and pass the list and item as arguments in the function call.

In this tutorial, we will learn how to add or append an element to a list in R, using append() function, with the help of example programs.

The syntax to of append() function is

append(myList, item, after = index)

The append() function appends the item item after specified position index in the list myList.

after parameter is optional. If no index is provided for after parameter, the item is appended at end of the list.

append() function does not modify the original list, but returns a new list.

In the following program, we will create a list with some initial values, and then append items to it using append() function.

example.R

myList <- list("Sunday", "Monday")
myList <- append(myList, "Tuesday")
print(myList)

Output

[[1]]
[1] "Sunday"

[[2]]
[1] "Monday"

[[3]]
[1] "Tuesday"

Now, let us create a list with some initial values, and append the element at specific index 2.

example.R

myList <- list("Sunday", "Monday", "Wednesday")
myList <- append(myList, "Tuesday", after = 2)
print(myList)

Output

[[1]]
[1] "Sunday"

[[2]]
[1] "Monday"

[[3]]
[1] "Tuesday"

[[4]]
[1] "Wednesday"

In this R Tutorial, we learned how to append an item to a list in R programming using append() function, with the help of examples.