👨‍💼 We need to convert user input into a number. If the input is invalid, we should throw an error and handle it gracefully so the program can keep running.

Sometimes the best control flow is to stop execution and report a problem:

try {
	const parsedValue = Number('not-a-number')
	if (Number.isNaN(parsedValue)) {
		throw new Error('Something went wrong')
	}
} catch (error) {
	console.error('Caught an error:', error)
}

🐨 Open . The starter provides:

Parse rawInput as a number inside a try/catch. If the input is not a valid number, throw an error whose message is exactly Invalid number: not-a-number (the prefix Invalid number: plus the raw input). On success, set resultMessage to describe the parsed value using the format Parsed value: <number>. On failure, set hadError to true and set resultMessage to Error: <error message> (so the thrown message appears after the Error: prefix).

Export resultMessage and hadError.

resultMessage, hadError

Edge cases to keep in mind: valid numeric strings should succeed and set resultMessage to the success format (no error); invalid input must throw and be caught without crashing the program.

📜 MDN - throw 📜 MDN - try...catch