Q2181. What is useImperativeHandle Hook? Give an example.
`useImperativeHandle` is a React Hook that allows a **child component** to expose **custom functions or properties** to its **parent component**, when using `ref`. It is ...
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Q2182. What are the different file-processing modes with Python?
We have the following modes- read-only – 'r' write-only – 'w' read-write – 'rw' append – 'a' We can open a text file with the option 't'. So to open a text file to read i...
Q2183. Why do we call javascript as dynamic language?
JavaScript is a loosely typed or a dynamic language because variables in JavaScript are not directly associated with any particular value type, and any variable can be as...
Q2184. When should you use useImperativeHandle?
The useImperativeHandler hook will be used in below cases: * You want to expose **imperative methods** from a child component - Custom input controls exposing `focus`, `c...
Q2185. What does the map() function do?
map() executes the function we pass to it as the first argument; it does so on all elements of the iterable in the second argument. Let's take an example, shall we? ```py...
Q2186. What is a void operator?
The `void` operator evaluates the given expression and then returns `undefined` (i.e, without returning value). The syntax would be as below, ```javascript void expressio...
Q2187. Is that possible to use useImperativeHandle without forwardRef?
**No.** `useImperativeHandle` only works when the component is wrapped in `forwardRef`. It's the combination that allows parent components to use a `ref` on a function co...
Q2188. Is there a way to remove the last object from a list?
Yes, there is. Try running the following piece of code- ```python >>> list=[1,2,3,4,5 ``` >>> list.pop(–1) 5 ```python >>> list ``` [1, 2, 3, 4]
Q2189. How to set the cursor to wait?
The cursor can be set to wait in JavaScript by using the property `cursor`. Let's perform this behavior on page load using the below function. ```javascript function myFu...
Q2190. How is useMemo different from useCallback?
The following table compares both useMemo and useCallback: | Feature | `useMemo` | `useCallback` | | --- | --- | --- | | **Purpose** | Memoizes the **result of a computat...