Q2071. How do you get a list of all the keys in a dictionary?
In Python, you retrieve dictionary keys using the **`.keys()`** method or by converting the dictionary directly to a `list`: ```python user = {'id': 101, 'username': 'ale...
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Q2072. How do you check whether an object can be extended or not?
The `Object.isExtensible()` method is used to determine if an object is extendable or not. i.e, Whether it can have new properties added to it or not. ```javascript const...
Q2073. How is `useReducer` Different from `useState`?
There are notable differences between `useState` and `useReducer` hooks. | Feature | `useState` | `useReducer` | |-----------------------|--------------------------------...
Q2074. How will you check if all characters in a string are alphanumeric?
Use the `.isalnum()` method on a string. It returns `True` if all characters in the string are alphanumeric (letters or numbers) and there is at least one character: ```p...
Q2075. How do you prevent an object from being extend?
The `Object.preventExtensions()` method is used to prevent new properties from ever being added to an object. In other words, it prevents future extensions to the object....
Q2076. What is useContext? What are the steps to follow for useContext?
The `useContext` hook is a built-in React Hook that lets you access the value of a context inside a functional component without needing to wrap it in a component. It hel...
Q2077. With Python, how do you find out which directory you are currently in?
To find this, we use the function/method getcwd(). We import it from the module os. ```python >>> import os ``` >>> os.getcwd() 'C:\\Users\\lifei\\AppData\\Local\\Program...
Q2078. What are the different ways to make an object non-extensible?
You can mark an object non-extensible in 3 ways, 1. `Object.preventExtensions` 2. `Object.seal` 3. `Object.freeze` ```javascript var newObject = {}; Object.preventExtensi...
Q2079. What are the use cases of useContext hook?
The `useContext` hook in React is used to share data across components without having to pass props manually through each level. Here are some common and effective use ca...
Q2080. How do you insert an object at a given index in Python?
Let's build a list first. ```python >>> a=[1,2,4] ``` Now, we use the method insert. The first argument is the index at which to insert, the second is the value to insert...