Character and String types in Swift - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this Swift code?

Consider the following Swift code snippet. What will it print?

Swift

let greeting: String = "Hello, 👋"
print(greeting.count)

A 7

B 8

C 9

D 6

💡 Hint

Remember that some emoji count as a single character in Swift strings.

The string "Hello, 👋" contains 7 visible characters plus the emoji 👋 which counts as one character, making the total count 8.

❓ Predict Output

intermediate

What is the output of this Swift code using Character type?

What will this Swift code print?

Swift

let letter: Character = "A"
print(letter.isLetter)

A nil

B false

C Compilation error

D true

💡 Hint

Check if the Character type has a property to check if it is a letter.

The Character type in Swift has the property isLetter which returns true if the character is a letter.

❓ Predict Output

advanced

What is the output of this Swift code with Unicode scalars?

What will this Swift code print?

Swift

let heart = "\u{2764}\u{FE0F}"
print(heart.count)

A 1

B 2

C 3

D 0

💡 Hint

Unicode scalars can combine to form a single character.

The two Unicode scalars combine to form a single emoji character, so the count is 1.

❓ Predict Output

advanced

What is the output of this Swift code using string interpolation with characters?

What will this Swift code print?

Swift

let char1: Character = "S"
let char2: Character = "w"
let char3: Character = "i"
let char4: Character = "f"
let char5: Character = "t"
let word = "\(char1)\(char2)\(char3)\(char4)\(char5)"
print(word)

A S w i f t

B [S, w, i, f, t]

C Swift

D Compilation error

💡 Hint

String interpolation joins characters into a string without spaces.

String interpolation concatenates the characters into the string "Swift" without spaces.

🧠 Conceptual

expert

How many characters are in this Swift string?

Consider the Swift string let s = "e\u{301}". How many characters does s.count return?

A 1

B 2

C 0

D Compilation error

💡 Hint

Unicode combining marks combine with base characters to form one character.

The string contains the letter 'e' plus a combining acute accent. Swift counts this as one character.