Adding items to arrays is one of the most fundamental operations in JavaScript development, essential for building dynamic user interfaces and managing data collections. As the creator of CoreUI, a widely used open-source UI library, I’ve implemented array manipulation countless times in components that handle dynamic lists, navigation menus, and data tables. From my expertise, the most efficient and widely supported method is using the push() method to add items to the end of an array. This approach is performant, intuitive, and works consistently across all JavaScript environments.