Q951. Explain the three states of promise?
Promises have three states: 1. **Pending:** This is an initial state of the Promise before an operation begins 2. **Fulfilled:** This state indicates that the specified o...
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Q952. Are custom DOM attributes supported in React v16?
**Note:** This question references React v16, which is outdated. The information below applies to React 16+, including current versions (React 18/19). Yes. Starting with ...
Q953. What is the purpose of next-env.d.ts?
**`next-env.d.ts`** is an auto-generated TypeScript declaration file placed at the root of a Next.js project. ### What It Does: It contains TypeScript reference directive...
Q954. How to make router param changes as reactive?
When you navigate from one URL to other(mapped with a single component) using routes with params then the same component instance will be reused. Even though it is more e...
Q955. A SELECT statement whose results are used in filtering the main query is called?
A `SELECT` statement nested inside another SQL statement to supply values for filtering or computation is called a **subquery** (also known as an **inner query** or **nes...
Q956. What is a lambda statement? Provide an example.
A lambda statement is used to create new function objects and then return them at runtime. Example: my_func=lambdax:x**2 creates a function called my_func that return s t...
Q957. What is the purpose of the <picture> element in HTML5, and how is it used to optimize images?
The `` element in HTML5 is used to provide multiple versions of an image at different resolutions or sizes, and allows the browser to choose the best version to display b...
Q958. What is a callback function?
A callback function is a function passed into another function as an argument. This function is invoked inside the outer function to complete an action. Let's take a simp...
Q959. How to loop inside JSX?
You can simply use `Array.prototype.map` with ES6 _arrow function_ syntax. For example, the `items` array of objects is mapped into an array of components: ```jsx harmony...
Q960. What is the purpose of next-compose-plugins?
**`next-compose-plugins`** was a popular community utility library used in older Next.js projects to cleanly chain and compose multiple configuration plugins in `next.con...