Which of the following Swift code snippets correctly uses the nil coalescing operator to assign a non-optional string to result?

easy📝 Syntax Q3 of 15

Swift - Optionals

Which of the following Swift code snippets correctly uses the nil coalescing operator to assign a non-optional string to result?

Alet result = optionalString ?? "Default"

Blet result = optionalString ? "Default"

Clet result = optionalString ?: "Default"

Dlet result = optionalString || "Default"

Step-by-Step Solution

Solution:

Step 1: Recognize correct nil coalescing usage
The operator ?? is used to provide a default value if the optional is nil.
Step 2: Validate each option
Only let result = optionalString ?? "Default" uses ?? correctly; others use invalid or different operators.
Final Answer:
let result = optionalString ?? "Default" -> Option A
Quick Check:
Correct nil coalescing syntax [OK]

Quick Trick: Use ?? to assign default when optional is nil [OK]

Common Mistakes:

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