[Solved] You have a list of user records as dictionaries:let users = [ ["name": "Alice", "age": 25], ["name": "Bob", "age": 17], ["name": "Cara", "age":... | Swift

Swift - Loops

You have a list of user records as dictionaries:

let users = [
  ["name": "Alice", "age": 25],
  ["name": "Bob", "age": 17],
  ["name": "Cara", "age": 30]
]

Using a for-in loop with a where clause, how do you print only the names of users who are 18 or older?

Afor user in users { if user["age"] >= 18 { print(user["name"]!) } }

Bfor user where (user["age"] as? Int ?? 0) >= 18 in users { print(user["name"]!) }

Cfor user in users if (user["age"] as? Int ?? 0) >= 18 { print(user["name"]!) }

Dfor user in users where (user["age"] as? Int ?? 0) >= 18 { print(user["name"]!) }

Step-by-Step Solution

Solution:

Step 1: Use correct for-in where syntax
The where clause must come after in users to filter users by age.
Step 2: Check type casting and condition
Use safe cast as? Int with default 0, then check if age >= 18.
Step 3: Print the name safely
Access user["name"]! to print the name string.
Final Answer:
for user in users where (user["age"] as? Int ?? 0) >= 18 { print(user["name"]!) } -> Option D
Quick Check:
Correct for-in where with safe cast [OK]

Quick Trick: Put where after in users with safe cast [OK]

Common Mistakes:

Master "Loops" in Swift

9 interactive learning modes - each teaches the same concept differently

More Swift Quizzes

You have a list of user records as dictionaries: