[Solved] Why does the Swift subtracting() method return a new set instead of modifying the original set? — Ans: Because sets are value types and methods return new copies | Swift

Swift - Collections

Why does the Swift subtracting() method return a new set instead of modifying the original set?

ABecause sets are value types and methods return new copies

BBecause sets cannot be changed once created

CBecause subtracting() is a static method

DBecause Swift does not support mutable collections

Step-by-Step Solution

Solution:

Step 1: Understand Swift sets as value types
Swift sets are value types, so methods like subtracting() return new sets instead of changing originals.
Step 2: Confirm other options are incorrect
Sets can be mutable, subtracting() is an instance method, and Swift supports mutable collections.
Final Answer:
Because sets are value types and methods return new copies -> Option A
Quick Check:
Value types return new copies, not modify originals [OK]

Quick Trick: Sets are value types; methods return new sets [OK]

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Why does the Swift subtracting() method return a new set instead of modifying the original set?