Fix: Bug: Missing error handling in calculator.js example

[github-actions]

This PR fixes issue #5

Changes Summary

I fixed the issue by:

1. Fixing the misleading comment on the divide() method that incorrectly stated "Divide numbers without any error handling" when it actually already had error handling for division by zero.
2. Adding proper error handling in the calc() method when the operation is division. This ensures that division by zero is caught and handled properly when using the calc() method.
3. Improving the variable naming in the calc() method for better readability, replacing x, y, and z with more descriptive num1, num2, and operation.
4. Adding a catch-all error for unknown operations.

The changes maintain the existing functionality while ensuring division by zero is properly handled throughout the calculator class.

Original Issue

The method in lacks proper error handling for division by zero.

Steps to reproduce

1. Create a Calculator instance
2. Call calculator.divide(10, 0)

Expected behavior

The function should handle division by zero by throwing a clear error message or returning an appropriate value.

Current behavior

The function returns Infinity without any error handling.

Fix suggestion

Please add appropriate error checking to prevent division by zero operations.

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[paul-fracture]

claude: give me some feedback on the calculator.

[github-actions]

The PR properly fixes the division by zero handling and improves variable naming. Consider consistent comparison operators (=== instead of ==), input validation for other operations, and factorial stack overflow prevention for large inputs.