[Solved] Find the error in this Swift code:var optionalString: String? = nil let result = optionalString ?? — Ans: Missing default value after ?? | Swift

Swift - Optionals

Find the error in this Swift code:

var optionalString: String? = nil
let result = optionalString ??

ANo error

BoptionalString cannot be nil

CMissing default value after ??

D?? operator used incorrectly with optional

Step-by-Step Solution

Solution:

Step 1: Check nil coalescing syntax
The operator ?? must be followed by a default value.
Step 2: Identify missing part
The code ends abruptly after ?? without a default value, causing a syntax error.
Final Answer:
Missing default value after ?? -> Option C
Quick Check:
?? must have a right side value [OK]

Quick Trick: Always provide a default value after ?? [OK]

Common Mistakes:

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