What is promise chaining in JavaScript?
Promise chaining is a technique in JavaScript that allows you to execute asynchronous operations in sequence. Instead of nesting callbacks, you can return a promise from a function and use .then()
to handle the result.
Can you give me an example of promise chaining?
Sure! Here's a simple example:
fetch('https://api.example.com/data')
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error('Error:', error));
In this example, the second .then()
waits for the first promise to resolve before executing.
What happens if one of the promises fails?
If a promise in the chain fails, the control jumps to the nearest .catch()
block. This allows you to handle errors gracefully.
Is promise chaining better than using async/await?
Both promise chaining and async/await have their advantages. Promise chaining can be more readable for simple sequences, while async/await can make complex asynchronous code easier to understand.
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