[Solved] Why does Swift use the ? suffix for optionals instead of allowing nil for all types by default? — Ans: To explicitly indicate variables that can be nil, improving safety | Swift

Swift - Optionals

Why does Swift use the ? suffix for optionals instead of allowing nil for all types by default?

ATo make code shorter and less clear

BBecause all variables in Swift are optional by default

CTo allow only constants to be nil

DTo explicitly indicate variables that can be nil, improving safety

Step-by-Step Solution

Solution:

Step 1: Understand Swift's safety design
Swift requires explicit optional declaration to avoid unexpected nil values and runtime crashes.
Step 2: Analyze the purpose of ? suffix
The ? suffix clearly marks variables that can be nil, making code safer and easier to understand.
Final Answer:
To explicitly indicate variables that can be nil, improving safety -> Option D
Quick Check:
Optional ? improves code safety by explicit nil allowance [OK]

Quick Trick: Use ? to mark variables that can be nil explicitly [OK]

Common Mistakes:

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Why does Swift use the ? suffix for optionals instead of allowing nil for all types by default?