What are the performance differences between promises and callbacks?

What are the performance differences between promises and callbacks?

Promises and callbacks are both used for handling asynchronous operations, but they have different performance characteristics. Callbacks can lead to 'callback hell' which makes code harder to read and maintain, while promises provide a cleaner, more manageable way to handle asynchronous code.

Can you explain why promises are generally preferred over callbacks?

Certainly! Promises allow for better error handling and chaining of asynchronous operations, making the code more readable. They also avoid the nesting issues that often occur with callbacks.

Are there any scenarios where callbacks might be better?

Yes, callbacks can be more efficient in scenarios where you need to perform a simple asynchronous task without the overhead of creating a promise. They can also be useful in environments that do not support promises.

How do I convert a callback-based function to use promises?

You can wrap the callback function in a new Promise. For example, if you have a function that takes a callback, you can create a promise that resolves or rejects based on the callback's execution.