Web development encompasses the creation and maintenance of websites and web applications. It involves various tasks, from designing user interfaces and crafting interactive experiences to backend server scripting and database management. Key technologies include HTML, CSS, JavaScript, and frameworks and libraries like React, Angular, and Node.js. Whether building a simple static site or a complex dynamic application, web development combines creativity and technical expertise to deliver engaging and functional digital experiences.
Javascript closures allow a function to access variables from an outer function even after the outer function has finished executing. This powerful feature enhances data encapsulation and modularity, enabling private variables and function factories. Closures are crucial for callbacks, event handlers, and maintaining state.
JavaScript promises are a cornerstone of modern asynchronous programming, providing a cleaner and more intuitive way to handle asynchronous operations compared to traditional callback functions. A promise represents the eventual result of an asynchronous operation, and it can be in one of three states: pending, fulfilled, or rejected.