Javascript Callback vs Promise and promises are both mechanisms used in JavaScript to handle asynchronous code and improve the readability and maintainability of code. it was Callbacks and promises are both mechanisms in JavaScript used to handle asynchronous operations but they different in terms of their structure and how they manage asynchronous code. However, Javascript Callback vs Promise have different approaches and syntax.
Callbacks:
Callbacks have been a traditional way to handle asynchronous operations in JavaScript. A callback is a function that is passed as an argument to another function. it is executed after the completion of an asynchronous operation.
Promises:
Promises provide a more structured and cleaner way to handle asynchronous operations. A promise represents a value that might be available now, or in the future, or never. It has three states: pending, fulfilled, or rejected.
Promises have become the preferred way to handle asynchronous code in modern JavaScript due to their improved readability, better error handling, and the ability to chain multiple asynchronous operations.
Async/Await:
Async/await is a syntactic sugar built on top of promises, providing a more synchronous-looking code structure for handling asynchronous operations. It makes asynchronous code more readable and easier to reason about.
Comparison:
1)Readability:
Callbacks can lead to callback hell or “pyramid of doom” when dealing with multiple nested asynchronous operations, making the code less readable.
2) Error Handling:
Callbacks rely on manual error-checking and handling within the callback function.
Promises have built-in error handling through the .catch method, which makes it easier to manage errors.
3) Chaining:
Chaining callbacks for multiple asynchronous operations can be cumbersome and less intuitive.
Promises allow for cleaner and more readable chaining of multiple asynchronous operations.
4) Composition:
Promises support composition and can be used with other promise-based functions easily in Callbacks might not compose well, leading to less modular and maintainable code.
5) Async/Await:
They provide a more structured and manageable way to work with asynchronous code. futher as more as Promises serve as the foundation for async/await, a syntax that further simplifies asynchronous code and enhances readability.
