Type casting with as, as?, as! in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to cast the variable to String using safe casting.

Swift

let anyValue: Any = "Hello"
let stringValue = anyValue [1] String

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

Aas?

Bas!

Cas

Dis

Attempts:

3 left

💡 Hint

Common Mistakes

Using as without optional, which causes a compile error.

Using is which only checks type but does not cast.

Use as? for safe optional casting in Swift.

2fill in blank

medium

Complete the code to force cast the variable to Int.

Swift

let anyValue: Any = 42
let intValue = anyValue [1] Int

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

Aas

Bas?

Cas!

Dis

Attempts:

3 left

💡 Hint

Common Mistakes

Using as? which returns an optional instead of force casting.

Using as which is for upcasting or bridging.

Use as! to force cast when you are sure of the type.

3fill in blank

hard

Fix the error in the code by choosing the correct casting operator.

Swift

let anyValue: Any = 3.14
let doubleValue = anyValue [1] Double

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

Ais

Bas?

Cas

Das!

Attempts:

3 left

💡 Hint

Common Mistakes

Using as which causes a compile-time error here.

Using as! which can crash if the cast fails.

Use as? for safe casting to avoid runtime errors.

4fill in blank

hard

Fill both blanks to cast and unwrap safely.

Swift

if let stringValue = anyValue [1] String [2] {
    print("Value is \(stringValue)")
}

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

Aas?

Bas!

Celse

Dis

Attempts:

3 left

💡 Hint

Common Mistakes

Using as! which is unsafe here.

Using is which does not cast.

Use as? for safe casting and else for the else block.

5fill in blank

hard

Fill all three blanks to cast an array element safely and print it.

Swift

let items: [Any] = ["apple", 5, 3.14]
if let firstItem = items[0] [1] String [2] {
    print("First item: \(firstItem) with length \(firstItem[3])")
}

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

Aas?

Bcount

Celse

Das!

Attempts:

3 left

💡 Hint

Common Mistakes

Using as! which can crash if the cast fails.

Using is instead of casting.

Trying to use length instead of count.

Use as? for safe casting, else for the else block, and count to get the string length.