You want to create a class Money where the + operator adds amounts but only if currencies match. How would you implement the + method?

hard📝 Application Q8 of 15

Ruby - Operators and Expressions

You want to create a class Money where the + operator adds amounts but only if currencies match. How would you implement the + method?

AAdd amounts ignoring currency differences.

BUse global variable to store currency and add amounts.

COverride + to always return zero.

DCheck currency equality, then add amounts; else raise error.

Step-by-Step Solution

Solution:

Step 1: Understand requirement
Only add amounts if currencies are the same to avoid mixing money types.
Step 2: Implement + method logic
Check if currencies match; if yes, add amounts; else raise an error.
Final Answer:
Check currency equality, then add amounts; else raise error. -> Option D
Quick Check:
Safe operator method checks conditions = B [OK]

Quick Trick: Validate operands inside operator methods for safety [OK]

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