Contributed to the bkeepers/vueuse repository by implementing function-based initial value support for the useArrayReduce composable. This work involved enhancing the composable to accept a function as the initial value, invoking it appropriately to enable dynamic initialization and broader API flexibility. The developer ensured backward compatibility and improved reliability by adding targeted tests that verify correct behavior when a function is provided, reducing the risk of regressions. All changes were delivered with minimal surface area and were CI-ready, reflecting a careful approach to maintainability. The work utilized JavaScript, TypeScript, and Vue.js, focusing on composable frontend development patterns.