Contributed two algorithmic utilities to the DaleStudy/leetcode-study repository, focusing on practical coding challenges in JavaScript. Developed a Contains Duplicate Detection function using a Set to achieve O(n) time and space complexity, accompanied by documentation updates to clarify return semantics and improve maintainability. Also implemented a Two Sum Solution leveraging a hash map for efficient O(n) performance, returning the indices of two numbers that sum to a target value. The work emphasized clear documentation, robust use of data structures, and attention to algorithmic efficiency, providing reusable solutions for coding practice and interview preparation without introducing any bug fixes during the period.