refactor: use Array.prototype.at() to look at the end

[ryuapp]

The size of the bundle is reduced by one ant teardrop.

The author should do the following, if applicable

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code
• Add TSDoc/JSDoc to document the code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.70%. Comparing base (76b7109) to head (4240f10).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3703      +/-   ##
==========================================
- Coverage   91.70%   91.70%   -0.01%     
==========================================
  Files         159      159              
  Lines       10162    10158       -4     
  Branches     2981     2830     -151     
==========================================
- Hits         9319     9315       -4     
  Misses        842      842              
  Partials        1        1              

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[yusukebe]

LGTM!

[yusukebe]

@ryuapp

Thanks! Merging.