Swift - Optionals
What will be the output of this Swift code?
var age: Int? = nil print(age!)
What will be the output of this Swift code?
medium📝 Predict Output Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Identify the value of the optional
The variableageis an optional Int set to nil.Step 2: Understand force unwrapping behavior on nil
Force unwrapping a nil optional causes a runtime crash (fatal error).Final Answer:
Runtime crash (fatal error) -> Option AQuick Check:
Force unwrap nil = crash [OK]
Quick Trick: Force unwrapping nil always crashes your program [OK]
Common Mistakes:
- Expecting nil or 0 output
- Confusing optional print with unwrapped print
- Assuming default values on nil
Master "Optionals" in Swift
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