fix: improve mean function with input validation and extended tests #1785

Adding input validation:
- Throws TypeError if input is not an array or contains non-number elements
- Throws Error if array is empty
Adding a comprehensive test suite using Vitest, which includes:
- Empty arrays
- Invalid elements like null, true, 'string'
- Floating-point numbers, negative values, large values
- Mixed integer and float arrays

The function now adheres more strictly to the expected behavior and is more robust against invalid input.

Checklist:

I have read CONTRIBUTING.md.
This pull request is all my own work -- I have not plagiarized.
I know that pull requests will not be merged if they fail the automated tests.
This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
All new JavaScript files are placed inside an existing directory.
All filenames use the UpperCamelCase (PascalCase) style.
All new algorithms have a URL in their comments that points to Wikipedia or another similar explanation.

@FatihBARACKILIC


 fix: improve mean function with input validation and extended tests

2b05c6b

@FatihBARACKILIC FatihBARACKILIC requested review from raklaptudirm and appgurueu as code owners

July 20, 2025 07:16

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codecov-commenter commented Jul 20, 2025

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.88%. Comparing base (1d252d7) to head (2b05c6b).

Additional details and impacted files

@@ Coverage Diff @@
## master #1785 +/- ##
=======================================
 Coverage 85.87% 85.88% 
=======================================
 Files 377 377 
 Lines 19720 19731 +11 
 Branches 3005 3008 +3 
=======================================
+ Hits 16935 16946 +11 
 Misses 2785 2785

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