Q2171. How do you load CSS and JS files dynamically?
You can create both link and script elements in the DOM and append them as child to head tag. Let's create a function to add script and style resources as below, ```javas...
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Q2172. Can useRef be used to store previous values?
Yes, `useRef` is a common pattern when you want to compare current and previous props or state without causing re-renders. **Example: Storing previous state value** ```js...
Q2173. Is del the same as remove()? What are they?
del and remove() are methods on lists/ ways to eliminate elements. ```python >>> list=[3,4,5,6,7] ``` >>> del list[3] ```python >>> list ``` [3, 4, 5, 7] ```python >>> li...
Q2174. What are the different methods to find HTML elements in DOM?
If you want to access any element in an HTML page, you need to start with accessing the document object. Later you can use any of the below methods to find the HTML eleme...
Q2175. Is it possible to access a ref in the render method?
Yes, you can access a ref in the render method, but what you get from it depends on how you're using the ref and when in the component lifecycle you're rendering. For exa...
Q2176. How do you open a file for writing?
Let's create a text file on our Desktop and call it tabs.txt. To open it to be able to write to it, use the following line of code- ```python >>> file=open('tabs.txt','w'...
Q2177. What is jQuery?
jQuery is a popular cross-browser JavaScript library that provides Document Object Model (DOM) traversal, event handling, animations and AJAX interactions by minimizing t...
Q2178. What are the common usecases of useRef hook?
Some of the common cases are: * Automatically focus an input when a component mounts. * Scroll to a specific element. * Measure element dimensions (`offsetWidth`, `client...
Q2179. Difference between the append() and extend() methods of a list.
The methods append() and extend() work on lists. While append() adds an element to the end of the list, extend adds another list to the end of a list. Let's take two list...
Q2180. What is V8 JavaScript engine?
V8 is an open source high-performance JavaScript engine used by the Google Chrome browser, written in C++. It is also being used in the node.js project. It implements ECM...