How to Iterate Over a List with Index in R - Step by Step Examples

How to Iterate Over a List with Index in R ?

To iterate over a list in R, you can use for loops or apply functions.

In this example,

numbers <- c(10, 20, 30, 40, 50)
for (number in numbers) {
  print(number)
}

[1] 10
[1] 20
[1] 30
[1] 40
[1] 50

In this example,

We create a list named names with character elements.
We use the lapply function to apply a function to each element of the list.
Within the function, we perform operations on each element or create a new list based on conditions.

names <- c('Alice', 'Bob', 'Charlie', 'David')
upper_names <- lapply(names, toupper)
print(upper_names)

[[1]]
[1] "ALICE"

[[2]]
[1] "BOB"

[[3]]
[1] "CHARLIE"

[[4]]
[1] "DAVID"

In this tutorial, we learned How to Iterate Over a List with Index in R language with well detailed examples.