What is the primary purpose of JavaScript frameworks like React or Angular?

The primary purpose of JavaScript frameworks such as React and Angular is to provide pre-built structures and functionalities for web application development. These frameworks are designed to streamline the process of building dynamic and interactive web applications. They offer a variety of features, such as components, state management, and routing, which facilitate the creation of complex user interfaces and improve development efficiency.

JavaScript frameworks support a modular approach to building applications, allowing developers to reuse components and implement best practices in web development. This helps in maintaining code quality and reduces the time needed to build scalable applications. React, for example, utilizes a component-based architecture, while Angular focuses on providing a sophisticated framework with a strong emphasis on two-way data binding.

The other options do not capture the primary function of these frameworks. While static website creation may involve different methods and technologies, React and Angular specifically cater to dynamic web applications. Enhancing server-side scripting capabilities and managing databases are also outside the primary focus of these frameworks, which center more on client-side development.