Understanding watchers in Vue

Vue's watcher function is a dynamic feature that enables developers to monitor changes in data and execute actions based on those changes, thereby enhancing the interactivity and responsiveness of Vue applications. The article explores the versatility of watchers, which can be implemented using both the Options API and the Composition API, providing the ability to access both the old and new values of a property. Watchers can be set to monitor nested property changes through the deep option and can be triggered immediately with the immediate option. Practical examples illustrate watchers in action, such as monitoring typing states, creating a real-time converter, or building a countdown timer, demonstrating their utility in real-world applications. Unlike computed properties, which are used to derive and return values, watchers are designed to perform side effects when data changes, making them a powerful tool for developers to react dynamically to state changes within their applications.