Implement _check

[Nikhil-Verma-01]

Summary

Refactored calculator validation logic by implementing the _check() helper and reusing it across all arithmetic methods.

Changes Made

• Implemented exports._check(x, y) to validate that both arguments are numbers
• Throws TypeError with existing error messages when inputs are invalid
• Updated add(), subtract(), multiply(), and divide() to call _check() exactly once
• Removed duplicated validation logic from all arithmetic functions

Why

This improves code quality by following the DRY (Don't Repeat Yourself) principle and centralizing input validation in one reusable function.

Result

• All test cases are now passing successfully

[dantharejabot]

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Thank you for the submission, @Nikhil-Verma-01! I'll review your code shortly, hang tight.

[dantharejabot]

This is a great attempt, @Nikhil-Verma-01!

I would like to request a few changes before merging your work. Please review my comments below and make the appropriate changes to your code.

After you update your code locally, follow the instructions to save your changes locally and push your changes to your fork.

When you push your changes to your fork, I'll come back for another review.

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There are 1 style guide violations in your contribution. I've marked them with inline comments for your convenience.

Please revisit your code and follow the style guide best practices.

Hint: You might be able to fix some issues automatically by running npm run lint -- --fix

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All the tests are passing. Nice job!

[dantharejabot]

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