Q571. What are typed arrays?
Typed arrays are array-like objects from ECMAScript 6 API for handling binary data. JavaScript provides 12 Typed array types, 1. Int8Array: An array of 8-bit signed integ...
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Q572. What is the useOptimistic hook?
`useOptimistic` enables optimistic UI updates - showing changes immediately before server confirmation. #### Basic Usage ```jsx import { useOptimistic } from 'react'; fun...
Q573. What are the advantages of module loaders?
The module loaders provides the below features, 1. Dynamic loading 2. State isolation 3. Global namespace isolation 4. Compilation hooks 5. Nested virtualization
Q574. What is the React Compiler (React Forget)?
The **React Compiler** (formerly known as React Forget) automatically optimizes your components by adding memoization where needed - eliminating the need for manual `useM...
Q575. What is string collation and Intl.Collator in JavaScript?
Collation is used for sorting a set of strings and searching within a set of strings. It is parameterized by locale and aware of Unicode. Let's take comparison and sortin...
Q576. What is for...of statement?
The for...of statement creates a loop iterating over iterable objects or elements such as built-in String, Array, Array-like objects (like arguments or NodeList), TypedAr...
Q577. What is the output of below spread operator array?
```javascript [..."John Resig"]; ``` The output of the array is ['J', 'o', 'h', 'n', ' ', 'R', 'e', 's', 'i', 'g'] **Explanation:** The string is an iterable type and the...
Q578. Is PostMessage secure?
Yes, postMessages can be considered very secure as long as the programmer/developer is careful about checking the origin and source of an arriving message. But if you try...
Q579. What are the problems with postmessage target origin as wildcard?
The second argument of postMessage method specifies which origin is allowed to receive the message. If you use the wildcard “\*” as an argument then any origin is allowed...
Q580. How do you avoid receiving postMessages from attackers?
Since the listener listens for any message, an attacker can trick the application by sending a message from the attacker’s origin, which gives an impression that the rece...