Swift - Basics and Runtime
You want to write a Swift program that safely calculates the average of an array of numbers, but the array might be empty. Which approach best uses Swift's safety features?
You want to write a Swift program that safely calculates the average of an array of numbers, but the array might be empty. Which approach best uses Swift's safety features?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand the problem with empty arrays
Dividing by zero (array count 0) causes a runtime error.Step 2: Use optional binding for safety
Optional binding lets you check if the array has elements before dividing, avoiding errors.Step 3: Evaluate options
Use optional binding to check if the array is empty before dividing uses Swift's safety features correctly; others risk errors or ignore safety.Final Answer:
Use optional binding to check if the array is empty before dividing -> Option DQuick Check:
Optional binding = safe checks [OK]
Quick Trick: Check array emptiness with optional binding before dividing [OK]
Common Mistakes:
- Dividing without checking for zero count
- Force unwrapping optionals causing crashes
- Ignoring empty arrays without handling
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