During December 2024, work focused on developing three core algorithmic features for the DaleStudy/leetcode-study repository using JavaScript, with an emphasis on data structures and dynamic programming. Solutions included identifying the top K frequent elements in an array through frequency mapping and sorting, efficiently finding the longest consecutive sequence in unsorted data using Sets for O(n) lookups, and implementing a dynamic programming approach to the House Robber problem to maximize non-adjacent sums with minimal space. The code prioritized clarity, performance, and reusability, supporting both interview preparation and teaching use cases, with no high-severity defects reported during the period.