Q31. What is top-level await in JavaScript modules?
Top-level await is a feature (introduced in ES2022) that allows you to use the `await` keyword at the top level of ES modules, outside of async functions. This enables mo...
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Q32. How does the Intersection Observer API work?
The Intersection Observer API provides a way to asynchronously observe changes in the intersection of a target element with an ancestor element or the viewport. **Basic u...
Q33. What are async iterators and how are they different from regular iterators?
Async iterators allow you to iterate over asynchronous data sources using `for await...of` loops, where each iteration can wait for a Promise to resolve. **Regular iterat...
Q34. What is the AbortController API and how is it used?
The AbortController API provides a way to abort one or more asynchronous operations, particularly useful for canceling fetch requests. **Basic usage:** ```javascript cons...
Q35. What is the difference between synchronous and asynchronous generators?
Synchronous and asynchronous generators differ in how they produce values and handle asynchronous operations. **Synchronous generator:** ```javascript function* syncGener...
Q36. What is the difference between synchronous and asynchronous code in JavaScript?
Synchronous code executes tasks in sequence and waits for each task to complete before moving on, while asynchronous code can execute multiple tasks simultaneously and do...
Q37. What are promises in JavaScript?
Promises in JavaScript are a way of handling async operations. They help us write async code that looks and behaves like sync code, making it easier to read and maintain....
Q38. What is the difference between async/await and promises in JavaScript?
Both async/await and Promises are used to handle asynchronous operations in JavaScript. However, async/await is built on top of Promises which makes asynchronous code mor...
Q39. How does control flow function in JS play a role in asynchronous operation in JavaScript?
Control flow functions provide mechanisms to coordinate and handle asynchronous operations, ensuring that certain actions occur before or after others. They help to maint...