Array operations (append, insert, remove) in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add a new element to the end of the array.

Swift

var fruits = ["Apple", "Banana"]
fruits.[1]("Orange")

Drag options to blanks, or click blank then click option'

Aremove

Binsert

CpopLast

Dappend

Attempts:

3 left

💡 Hint

Common Mistakes

Using insert without specifying an index.

Trying to remove instead of add.

The append method adds a new element to the end of the array.

2fill in blank

medium

Complete the code to insert an element at the start of the array.

Swift

var numbers = [2, 3, 4]
numbers.[1](1, at: 0)

Drag options to blanks, or click blank then click option'

Aappend

Binsert

Cremove

DpopLast

Attempts:

3 left

💡 Hint

Common Mistakes

Using append which always adds at the end.

Using remove which deletes elements.

The insert(_:at:) method inserts an element at a specified position in the array.

3fill in blank

hard

Complete the code to remove the element "Banana" from the array.

Swift

var fruits = ["Apple", "Banana", "Cherry"]
fruits.[1](at: 1)

Drag options to blanks, or click blank then click option'

Aremove

Bappend

Cinsert

DpopLast

Attempts:

3 left

💡 Hint

Common Mistakes

Using append or insert which add elements instead of removing.

Using popLast which removes the last element, not a specific one.

The remove(at:) method removes an element at a specified index in the array. Here, index 1 corresponds to "Banana".

4fill in blank

hard

Fill both blanks to insert "Grape" at index 2 and then remove the element at index 0.

Swift

var fruits = ["Apple", "Banana", "Cherry"]
fruits.[1]("Grape", at: 2)
fruits.[2](at: 0)

Drag options to blanks, or click blank then click option'

Ainsert

Bappend

Cremove

DpopLast

Attempts:

3 left

💡 Hint

Common Mistakes

Using append instead of insert for adding at a specific index.

Using popLast instead of remove(at:) for removing at a specific index.

Use insert(_:at:) to add an element at a specific index and remove(at:) to remove an element at a specific index.

5fill in blank

hard

Fill all three blanks to append "Kiwi", insert "Mango" at index 1, and remove the last element.

Swift

var fruits = ["Apple", "Banana"]
fruits.[1]("Kiwi")
fruits.[2]("Mango", at: 1)
fruits.[3]()

Drag options to blanks, or click blank then click option'

Aremove

Bappend

Cinsert

DpopLast

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up append and insert.

Using remove() without index to remove last element.

append adds an element at the end, insert(_:at:) inserts at a specific index, and popLast() removes the last element.