Q941. What is the Intl.NumberFormat API and how is it used?
The `Intl.NumberFormat` API provides language-sensitive number formatting, allowing you to format numbers according to locale-specific conventions. ```javascript // Basic...
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Q942. How do you implement method chaining in JavaScript?
Method chaining is a pattern where multiple methods are called on the same object sequentially by returning `this` from each method. ```javascript class Calculator { cons...
Q943. What are the differences between Map and Object for storing key-value pairs?
While both Map and Object store key-value pairs, they have significant differences: **Key types:** ```javascript // Object - keys are always strings or symbols const obj ...
Q944. What is the purpose of Symbol.iterator and how do you use it?
`Symbol.iterator` is a well-known symbol that specifies the default iterator for an object, making it iterable with `for...of` loops and spread operators. ```javascript /...
Q945. 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...
Q946. 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...
Q947. What is the purpose of Object.getOwnPropertyDescriptors()?
`Object.getOwnPropertyDescriptors()` returns all own property descriptors of an object, including their attributes (value, writable, enumerable, configurable, get, set). ...
Q948. How does Promise.allSettled() differ from Promise.all()?
`Promise.allSettled()` and `Promise.all()` both handle multiple promises, but they behave differently when promises are rejected. **Promise.all() - fails fast:** ```javas...
Q949. What are the performance implications of using try-catch in JavaScript?
Try-catch blocks have performance implications, especially when used in hot code paths or when exceptions are frequently thrown. **Performance impact:** ```javascript // ...
Q950. 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...