Aniruddha Bongale — R50-T045: Make verification repeatable for palindromeRearranging (CheckRearrangePalindrome.js) [String/CheckRearrangePalindrome.js] #45

Student: Aniruddha Bongale

Task: R50-T045 · 5 of 10
Repository: https://github.com/S-AI-Projects/TheAlgorithms-JavaScript
Assigned working branch: student/e26b07f0827

Goal

Work on String/CheckRearrangePalindrome.js. Control the external state used while testing palindromeRearranging. For a pure function, verify repeated calls and input isolation; for time, randomness, network or UI code, inject or mock the relevant dependency. Fixture: Use 0, 7, 121, 120 and 1221 for an integer interface, or "", "a", "aba", "ab" and "abba" for a string interface. Specify whether normalization is part of this function before comparing with reversal.

Steps

1. Read String/CheckRearrangePalindrome.js, especially palindromeRearranging near line 9. Record its public inputs, result, mutation behavior and any external dependencies before changing it.
2. Identify every observable dependency used by this item; explicitly state when none exists.
3. Run the same fixture twice in fresh isolated state and once after another valid input; assert that earlier runs cannot alter the later result.
4. Implement work/R50-T045/check.py as a focused runner that executes the new checks and propagates failures. Native check to incorporate: run the repository test script in non-watch mode after installing from its lockfile; for browser-only code use a browser test instead of plain Node. Record the actual command and nonzero test count.
5. Create the checks specified below and run python3 work/R50-T045/check.py. Save inputs, expected versus actual results and tool versions in work/R50-T045/; a check must exit non-zero when an assertion fails.
6. Commit the repository change on branch R50-T045; prepare a PR to the organisation fork explaining the result and linking the checks. Keep each task independently reviewable. Remove work/R50-T045/ from a later upstream branch.

Done when

☐ The checked behavior is tied to palindromeRearranging in String/CheckRearrangePalindrome.js; every assertion has an explicit expected value.
☐ Use 0, 7, 121, 120 and 1221 for an integer interface, or "", "a", "aba", "ab" and "abba" for a string interface. Specify whether normalization is part of this function before comparing with reversal.
☐ Existing supported behavior and the public interface are preserved unless a failing regression demonstrates and documents a defect.
☐ The focused test works without live network access, a real user account or GUI interaction.
☐ Any introduced dependency parameter has a default preserving current callers.

Submission checklist

• Complete this task and its checks.
• Add the required evidence and link your pull request here.
• Select this S-AI-Projects fork as the PR base repository.
• Request instructor review.

Keep this PR focused on this task. Do not submit assignment PRs to the upstream repository.