Tarun Y — R50-T026: Simplify one responsibility in modularBinaryExponentiation (ModularBinaryExponentiationRecursive.js) [Maths/ModularBinaryExponentiationRecursive.js] #26

Student: Tarun Y

Task: R50-T026 · 6 of 10
Repository: https://github.com/S-AI-Projects/TheAlgorithms-JavaScript
Assigned working branch: student/e26b07f0633

Goal

Work on Maths/ModularBinaryExponentiationRecursive.js. Refactor one coherent calculation in modularBinaryExponentiation while preserving its behavior for the fixture. Name the particular state or operation made clearer in the PR. Fixture: Use the smallest valid input and one ordinary input for modularBinaryExponentiation from Maths/ModularBinaryExponentiationRecursive.js. Write the literal inputs and independently calculated expected outputs in the tests before editing the implementation. The check must name the source line establishing each precondition.

Steps

1. Read Maths/ModularBinaryExponentiationRecursive.js, especially modularBinaryExponentiation near line 9. Record its public inputs, result, mutation behavior and any external dependencies before changing it.
2. First capture behavior in tests; identify the smallest contiguous responsibility that can be named clearly.
3. Extract or simplify that responsibility without changing algorithm, return type, ordering, side effects or public arguments.
4. Implement work/R50-T026/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-T026/check.py. Save inputs, expected versus actual results and tool versions in work/R50-T026/; a check must exit non-zero when an assertion fails.
6. Commit the repository change on branch R50-T026; prepare a PR to the organisation fork explaining the result and linking the checks. Keep each task independently reviewable. Remove work/R50-T026/ from a later upstream branch.

Done when

☐ The checked behavior is tied to modularBinaryExponentiation in Maths/ModularBinaryExponentiationRecursive.js; every assertion has an explicit expected value.
☐ Use the smallest valid input and one ordinary input for modularBinaryExponentiation from Maths/ModularBinaryExponentiationRecursive.js. Write the literal inputs and independently calculated expected outputs in the tests before editing the implementation. The check must name the source line establishing each precondition.
☐ Existing supported behavior and the public interface are preserved unless a failing regression demonstrates and documents a defect.
☐ The before/after tests agree and the diff contains one explained readability improvement.
☐ The change is not a repository-wide formatting pass or an unmeasured optimization.

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.