You want to raise a custom error type ArgumentError with a message "Invalid input" when a method receives a negative number. Which code correctly does this?
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Ruby - Error Handling
You want to raise a custom error type ArgumentError with a message "Invalid input" when a method receives a negative number. Which code correctly does this?
AArgumentError.raise("Invalid input") if number < 0
Braise ArgumentError, "Invalid input" if number < 0
Craise "ArgumentError: Invalid input" if number < 0
Draise ArgumentError("Invalid input") if number < 0
Step-by-Step Solution
Solution:
Step 1: Understand how to raise custom error types
In Ruby, you can raise a specific error class by passing it as the first argument to raise, followed by the message.
Step 2: Check each option's syntax
raise ArgumentError, "Invalid input" if number < 0 correctly uses raise ArgumentError, "Invalid input". raise "ArgumentError: Invalid input" if number < 0 treats the error as a string only. ArgumentError.raise("Invalid input") if number < 0 is invalid as raise is not a method on ArgumentError. raise ArgumentError("Invalid input") if number < 0 is invalid syntax.
Final Answer:
raise ArgumentError, "Invalid input" if number < 0 -> Option B
Quick Check:
Raise with error class and message = C [OK]
Quick Trick:Use raise ErrorClass, "message" for custom errors [OK]
Common Mistakes:
Passing error as string only
Using wrong syntax with parentheses
Confusing new method call with raise
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