Swift - Optionals
What does the question mark (?) signify when used in a Swift variable declaration like
var age: Int??What does the question mark (?) signify when used in a Swift variable declaration like var age: Int??
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Identify the meaning of ? in Swift
The question mark after a type means the variable can hold a value or no value (nil).Step 2: Understand optional behavior
This makes the variable optional, requiring safe unwrapping before use.Final Answer:
The variable is an optional and may hold a value or nil -> Option DQuick Check:
Question mark means optional = B [OK]
Quick Trick: ? means the variable can be nil or hold a value [OK]
Common Mistakes:
- Confusing ? with constant declaration
- Assuming ? means string type
- Thinking ? auto unwraps the value
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