How to write a declarative JavaScript promise wrapper

JavaScript, a single-threaded language, traditionally executes code synchronously, but asynchronous programming allows functions to run concurrently, improving efficiency especially in tasks like API calls and file handling. Asynchronous functions in JavaScript can be managed using promises, which handle completed or failed tasks, and the async/await syntax, which provides a cleaner approach to handling asynchronous operations. The guide discusses the benefits of declarative programming, which improves code readability and maintenance by using built-in methods over detailed step-by-step instructions. It introduces a custom promise wrapper function to manage multiple asynchronous functions efficiently, and explains the use of Promise.all() and Promise.allSettled() for handling multiple promises, highlighting their differences based on whether tasks are interdependent. The guide also provides practical examples, such as generating short URLs and managing API requests, to illustrate effective use of these JavaScript features, emphasizing the importance of understanding trade-offs for different use cases in asynchronous programming.