Array operations (append, insert, remove) in Swift - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the append() method do in a Swift array?

It adds a new element to the end of the array, increasing its size by one.

beginner

How do you insert an element at a specific position in a Swift array?

Use the insert(_:at:) method, specifying the element and the index where you want to add it.

beginner

What happens when you use remove(at:) on a Swift array?

It removes the element at the specified index and shifts the remaining elements to fill the gap.

beginner

If you want to remove the last element of a Swift array, which method do you use?

Use removeLast() to remove and return the last element of the array.

intermediate

Can you append multiple elements to a Swift array at once? If yes, how?

Yes, use the append(contentsOf:) method with another array or sequence of elements.

Which method adds a single element to the end of a Swift array?

A pop()

B insert()

C remove()

D append()

The append() method adds one element to the end of the array.

How do you add an element at index 2 in a Swift array named 'fruits'?

A fruits.insert("apple", at: 2)

B fruits.remove(at: 2)

C fruits.append(2)

D fruits.add(at: 2)

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

What does remove(at: 0) do to an array?

A Removes the first element

B Removes the last element

C Removes all elements

D Adds an element at the start

remove(at: 0) removes the element at index 0, which is the first element.

Which method removes and returns the last element of a Swift array?

A deleteLast()

B removeFirst()

C removeLast()

D popLast()

removeLast() removes and returns the last element.

How can you add multiple elements to a Swift array at once?

A insertMultiple()

B append(contentsOf:)

C addAll()

D appendAll()

append(contentsOf:) adds multiple elements from another collection.

Explain how to add, insert, and remove elements in a Swift array with examples.

Think about how you add things to a list, put things in the middle, or take things out.

Describe the difference between append() and insert(_:at:) in Swift arrays.

One adds to the end, the other lets you choose the spot.