Swift - Operators and Expressions
Which operator in Swift safely unwraps an optional and provides a default value if nil?
Which operator in Swift safely unwraps an optional and provides a default value if nil?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Identify the operator that provides a default
The??operator unwraps an optional or returns a default if nil.Step 2: Differentiate from other operators
!force unwraps (unsafe),?.safely accesses properties,->is for function return types.Final Answer:
?? -> Option CQuick Check:
Default value operator = ?? [OK]
Quick Trick: Use ?? to provide defaults for nil optionals [OK]
Common Mistakes:
- Using ! which can crash if nil
- Confusing ?. with ??
- Thinking -> unwraps optionals
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