- Using try-catch blocks
- Handling errors in promises
- Error handling with async-await
Using try-catch blocks
try-catch blocks. The
try block contains the code that may throw an error, while the
catch block handles the error if it occurs.
Handling errors in promises
catch method, which is called when the promise is rejected.
You can also handle both fulfilled and rejected promises using the
then method with two arguments: the first one is a callback for the fulfilled promise, and the second one is a callback for the rejected promise.
Error handling with async-await
async-await, you can use a
try-catch block inside an
- Try-catch-finally block: This allows you to handle exceptions by wrapping your code inside a
tryblock, catching any errors with a
catchblock, and executing cleanup code in a
- Callbacks: You can pass callback functions as arguments to other functions, and invoke them when an error or exceptional situation occurs.
- Promises: Promises are a more modern approach to handling asynchronous operations and errors, with the
You can use a try-catch-finally block like this:
Place the code that might throw an error inside the
try block. If an error is thrown, the
catch block will be executed with the error object. The
finally block is optional and will always be executed after the try and catch blocks, whether an error was thrown or not.
How can I handle errors with callbacks?
When using callbacks to handle errors, you generally follow the "error-first" pattern, where the first argument of the callback function is reserved for an error object. Here's an example:
What are the benefits of using Promises and async/await for error handling?
Promises and async/await provide a more structured and readable way of handling errors, especially in asynchronous code. Promises allow you to chain
catch methods to handle success and error cases in a more linear fashion. Async/await, on the other hand, makes your asynchronous code look more like synchronous code, allowing you to use try-catch blocks for error handling. This can make it easier to understand and maintain your code.