Nested lists in R Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a nested list with two elements.

R Programming

nested_list <- list(1, [1])

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Amatrix(2, 3)

B2:3

Clist(2, 3)

Dc(2, 3)

Attempts:

3 left

💡 Hint

Common Mistakes

Using c(2, 3) creates a vector, not a nested list.

Using 2:3 creates a sequence, not a nested list.

The list() function creates a nested list. Using list(2, 3) as the second element nests another list inside the main list.

2fill in blank

medium

Complete the code to access the second element of the nested list.

R Programming

nested_list <- list(1, list(2, 3))
second_element <- nested_list[[[1]]]

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A1

B2

C3

D4

Attempts:

3 left

💡 Hint

Common Mistakes

Using single brackets [ ] returns a sublist, not the element itself.

Using the wrong index number.

In R, double square brackets [[ ]] access elements of a list. The second element is at position 2.

3fill in blank

hard

Fix the error in the code to access the number 3 inside the nested list.

R Programming

nested_list <- list(1, list(2, 3))
value <- nested_list[[2]][[[1]]]

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A2

B1

C3

D4

Attempts:

3 left

💡 Hint

Common Mistakes

Using [[1]] returns 2, not 3.

Using single brackets [ ] instead of double brackets.

The inner list is at position 2 inside the second element. So to get the number 3, use [[2]] on the inner list.

4fill in blank

hard

Fill both blanks to create a nested list and access the number 4 inside it.

R Programming

nested_list <- list(1, list(3, [1]))
value <- nested_list[[2]][[[2]]]

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A4

B1

C2

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the positions of elements in the inner list.

Using wrong indices to access elements.

The inner list contains 3 and 4. To access 4, put it as the second element in the inner list and access it with [[2]][[2]].

5fill in blank

hard

Fill all three blanks to create a nested list and access the number 6 inside it.

R Programming

nested_list <- list([1], list([2], 6))
value <- nested_list[[[3]]][[2]]

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A5

B4

C1

D2

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong indices to access elements.

Confusing the order of elements in the lists.

The outer list has 5 and an inner list with 4 and 6. To access 6, get the second element of the outer list with [[2]] and then the second element inside it.