[Solved] You want to create a function that modifies a dictionary passed as a parameter without changing the original dictionary outside the... Why does Swift's value type behavior for collections help here? | Swift

Swift - Collections

You want to create a function that modifies a dictionary passed as a parameter without changing the original dictionary outside the function. Why does Swift's value type behavior for collections help here?

ABecause dictionaries are reference types and share data automatically

BBecause the dictionary is copied when passed, so original stays unchanged

CBecause Swift prevents any modification inside functions

DBecause the function must return a new dictionary explicitly

Step-by-Step Solution

Solution:

Step 1: Understand parameter passing for value types
When a dictionary is passed to a function, Swift copies it, so the function works on a separate copy.
Step 2: Effect on original dictionary
Modifications inside the function do not affect the original dictionary outside because of this copy.
Final Answer:
Because the dictionary is copied when passed, so original stays unchanged -> Option B
Quick Check:
Value type copy on function call = Because the dictionary is copied when passed, so original stays unchanged [OK]

Quick Trick: Function gets copy; original dictionary safe [OK]

Common Mistakes:

Assuming dictionaries are reference types
Thinking original changes without explicit return
Believing Swift forbids modification inside functions

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More Swift Quizzes

Why does Swift's value type behavior for collections help here?

Step 1: Understand parameter passing for value types

Step 2: Effect on original dictionary

Final Answer:

Quick Check:

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