Q81. Is it possible to prevent automatic batching?
Yes, it is possible to prevent automatic batching default behavior. There might be cases where you need to re-render your component after each state update or updating on...
Technical Question Bank · Peer-Reviewed
Job Interview Questions and Answers Directory
Search and filter frequently asked interview questions across technical, programming, and behavioral domains. Tailor your interview preparation by difficulty for freshers or experienced developers (154 available).
Active:
Tag: state ×
Q82. How do you update objects inside state?
You cannot update the objects which exists in the state directly. Instead, you should create a fresh new object (or copy from the existing object) and update the latest s...
Q83. How do you update nested objects inside state?
You cannot simply use spread syntax for all kinds of objects inside state. Because spread syntax is shallow and it copies properties for one level deep only. If the objec...
Q84. How do you update arrays inside state?
Eventhough arrays in JavaScript are mutable in nature, you need to treat them as immutable while storing them in a state. That means, similar to objects, the arrays canno...
Q85. How do you use immer library for state updates?
Immer library enforces the immutability of state based on **copy-on-write** mechanism. It uses JavaScript proxy to keep track of updates to immutable states. Immer has 3 ...
Q86. What are the benefits of preventing the direct state mutations?
In React and modern JavaScript state management, **immutability** (preventing direct mutation of state objects and arrays) is a core foundational architectural requiremen...
Q87. What are the preferred and non-preferred array operations for updating the state?
The below table represent preferred and non-preferred array operations for updating the component state. | Action | Preferred | Non-preferred | | --------- | ------------...
Q88. 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 ...
Q89. How is `useReducer` Different from `useState`?
There are notable differences between `useState` and `useReducer` hooks. | Feature | `useState` | `useReducer` | |-----------------------|--------------------------------...
Q90. What is an updater function? Should an updater function be used in all cases?
An **updater function** is a form of `setState` where you pass a **function** instead of a direct value. This function receives the **previous state** as an argument and ...