You want to safely iterate over a dictionary scores to print keys and values. Which Swift loop ensures safety and prevents runtime errors?

hard📝 Application Q15 of 15

Swift - Loops

You want to safely iterate over a dictionary scores to print keys and values. Which Swift loop ensures safety and prevents runtime errors?

Afor i in 0...scores.count { print(scores[i]) }

Bfor key in scores.keys { print(scores[key]) }

Cfor (key, value) in scores { print(key, value) }

Dwhile true { print(scores) }

Step-by-Step Solution

Solution:

Step 1: Understand dictionary iteration in Swift
Swift allows safe iteration over dictionaries using for (key, value) in dictionary.
Step 2: Evaluate options for safety
for (key, value) in scores { print(key, value) } uses correct syntax and safely accesses keys and values. for i in 0...scores.count { print(scores[i]) } is invalid for dictionaries, C risks optional unwrapping, D causes infinite loop.
Final Answer:
for (key, value) in scores { print(key, value) } -> Option C
Quick Check:
Safe dictionary loop = for (key, value) in scores { print(key, value) } [OK]

Quick Trick: Use for (key, value) in dictionary for safe iteration [OK]

Common Mistakes:

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