[Solved] What does the nil coalescing operator ?? do in Swift? — Ans: It provides a default value if an optional is nil. | Swift

Swift - Optionals

What does the nil coalescing operator ?? do in Swift?

AIt unwraps an optional without checking for nil.

BIt provides a default value if an optional is nil.

CIt converts a non-optional to an optional.

DIt forces a runtime error if the optional is nil.

Step-by-Step Solution

Solution:

Step 1: Understand optional values
Optionals may contain a value or nil (no value).
Step 2: Role of nil coalescing operator
The operator ?? returns the optional's value if it exists; otherwise, it returns the default value provided.
Final Answer:
It provides a default value if an optional is nil. -> Option B
Quick Check:
Nil coalescing = default value if nil [OK]

Quick Trick: Remember: ?? means "use this if nil" [OK]

Common Mistakes:

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What does the nil coalescing operator ?? do in Swift?