Q801. What is the pass statement in Python?
There may be times in our code when we haven't decided what to do yet, but we must type something for it to be syntactically correct. In such a case, we use the pass stat...
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Q802. What are the guidelines to be followed for writing reducers?
There are two guidelines to be taken care while writing reducers in your code. 1. Reducers must be pure without mutating the state. That means, same input always returns ...
Q803. How does ReactJS work behind the scenes?
ReactJS is a powerful JavaScript library for building user interfaces. While it appears simple on the surface, React performs a lot of complex operations behind the scene...
Q804. 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...
Q805. How is `useReducer` Different from `useState`?
There are notable differences between `useState` and `useReducer` hooks. | Feature | `useState` | `useReducer` | |-----------------------|--------------------------------...
Q806. 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....
Q807. 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...
Q808. How do you define multiple properties on an object?
The `Object.defineProperties()` method is used to define new or modify existing properties directly on an object and returning the object. Let's define multiple propertie...
Q809. What is the MEAN stack?
The MEAN (MongoDB, Express, AngularJS, and Node.js) stack is the most popular open-source JavaScript software tech stack available for building dynamic web apps where you...
Q810. What are the differences between page router and app router in nextjs?
Next.js provides two different routing systems: the **Page Router** (traditional) and the **App Router** (introduced in Next.js 13). The App Router is built on React Serv...