Q741. What is the difference between const and Object.freeze?
The main difference is that `const` applies to **variables** (bindings), while `Object.freeze()` applies to **values** (objects). 1. **`const`**: Prevents the reassignmen...
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Q742. What is Promise.any and when should it be used?
`Promise.any()` is a Promise combinator method introduced in ES2021 that takes an iterable of promises and returns a single promise that fulfills as soon as any of the in...
Q743. What is BigInt and how is it different from Number?
`BigInt` is a built-in JavaScript object (introduced in ES2020) that provides a way to represent whole numbers larger than 2^53 - 1 (the largest number JavaScript can rel...
Q744. What are private class fields in JavaScript?
Private class fields (introduced in ES2022) are class properties that are only accessible within the class itself. They are prefixed with a hash symbol (`#`) and provide ...
Q745. What is the Array.prototype.at() method and why is it useful?
The `at()` method (introduced in ES2022) allows you to access array elements using both positive and negative indices. It provides a simpler and more intuitive way to acc...
Q746. 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...
Q747. What are WeakRef and FinalizationRegistry used for?
`WeakRef` and `FinalizationRegistry` are advanced features (introduced in ES2021) for managing memory and object lifecycles in JavaScript. They provide low-level control ...
Q748. What are logical assignment operators?
Logical assignment operators (introduced in ES2021) combine logical operations (`&&`, `||`, `??`) with assignment (`=`). They provide a concise way to assign values based...
Q749. What is the Temporal API and why is it proposed as a replacement for Date?
The Temporal API is a modern proposal (Stage 3) to replace JavaScript's problematic `Date` object. It provides a better, more intuitive way to work with dates and times i...
Q750. What is the difference between for loop and forEach?
Both are used to iterate over arrays, but they differ in performance, flexibility, and purpose. The `for` loop is a core JavaScript statement that gives you full control ...