Q11. What is promise.all?
`Promise.all()` is a built-in JavaScript method used to handle multiple asynchronous operations together. It accepts an iterable of promises (usually an array) and return...
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Q12. What are the pros and cons of promises over callbacks?
Below are the list of pros and cons of promises over callbacks, **Pros:** 1. It avoids callback hell which is unreadable 2. Easy to write sequential asynchronous code wit...
Q13. How do you make asynchronous HTTP request?
Browsers provide an XMLHttpRequest object which can be used to make asynchronous HTTP requests from JavaScript by passing the 3rd parameter as true. ```javascript functio...
Q14. What is nodejs?
Node.js is a server-side platform built on Chrome's JavaScript runtime for easily building fast and scalable network applications. It is an event-based, non-blocking, asy...
Q15. What is the event queue?
The event queue follows the queue data structure. It stores async callbacks to be added to the call stack. It is also known as the Callback Queue or Macrotask Queue. When...
Q16. What are dynamic imports?
The dynamic imports using `import()` function syntax allows us to load modules on demand by using promises or the async/await syntax. Currently this feature is in [stage4...
Q17. Is postMessages synchronous?
The postMessages are synchronous in IE8 browser but they are asynchronous in IE9 and all other modern browsers (i.e, IE9+, Firefox, Chrome, Safari).Due to this asynchrono...
Q18. What are asynchronous thunks?
The asynchronous thunks are useful to make network requests. Let's see an example of network requests, ```javascript function fetchData(fn) { fetch("https://jsonplacehold...
Q19. What is AJAX?
AJAX stands for Asynchronous JavaScript and XML and it is a group of related technologies(HTML, CSS, JavaScript, XMLHttpRequest API etc) used to display data asynchronous...
Q20. What are the different ways to deal with Asynchronous Code?
Below are the list of different ways to deal with Asynchronous code. 1. Callbacks 2. Promises 3. Async/await 4. Third-party libraries such as async.js,bluebird etc