Q701. What are uncontrolled components?
The **Uncontrolled components** are form elements (like ``, ``, or ``) that **manage their own state internally** via the **DOM**, rather than through React state. You ca...
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Q702. What does the `dynamic` export do in the App Router?
Exporting `dynamic` controls how a route is rendered: `'force-dynamic'`, `'force-static'`, or `'auto'`. Use it to override Next.js detection — for example, force dynamic ...
Q703. Why do you need to use key attribute on for directive?
In order to track each node's identity, and thus reuse and reorder existing elements, you need to provide a unique `key` attribute for each item with in `v-for` iteration...
Q704. How to select 10 random rows?
```sql -- MySQL SELECT * FROM tbl ORDER BY RAND() LIMIT 10; -- PostgreSQL SELECT * FROM tbl ORDER BY RANDOM() LIMIT 10; -- SQL Server SELECT TOP 10 * FROM tbl ORDER BY NE...
Q705. In Python what are iterators?
An **iterator** in Python is an object that represents a stream of data. It implements the **Python Iterator Protocol**, which consists of two core magic methods: 1. **`_...
Q706. What is an HTML form?
An **HTML form** (``) is a document container designed to collect user input and transmit it securely to a web server or client-side JavaScript handler. ### Core Form Ana...
Q707. Can TypeScript be used for the backend?
Yes, TypeScript can be used for backend development. TypeScript is a superset of JavaScript that adds static typing and other features to JavaScript, making it more suita...
Q708. What is the Temporal Dead Zone?
The **Temporal Dead Zone (TDZ)** refers to the period between the start of a block and the point where a variable declared with `let` or `const` is initialized. During th...
Q709. What is the difference between createElement and cloneElement?
Both `React.createElement` and `React.cloneElement` are used to work with React elements, but they serve different purposes. #### **createElement:** Creates a new React e...
Q710. How do you set head metadata per-route with `head.js` / `head.tsx`?
In the App Router you can create a `head.js` or `head.tsx` file inside a route segment to return `` elements (title, meta, link) for that segment. This is preferred for c...