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ZingHR Interview Questions and Answers

Updated 28 Nov 2024

Q1. What is Redux and state management?

Ans.

Redux is a predictable state container for JavaScript apps. It helps manage the state of an application in a centralized way.

  • Redux is a state management library commonly used with React.

  • It allows for a single source of truth for the state of an application.

  • Actions are dispatched to update the state, and reducers specify how the state changes in response to actions.

  • Redux DevTools can be used to track state changes and debug the application.

  • Selectors can be used to efficiently ...read more

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Q2. What is useState?

Ans.

useState is a hook in React that allows functional components to have state.

  • useState is a React hook used in functional components to manage state.

  • It returns an array with the current state value and a function to update that value.

  • Example: const [count, setCount] = useState(0);

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Q3. What's useEffect?

Ans.

useEffect is a hook in React that allows performing side effects in function components.

  • Used in React functional components to perform side effects

  • Executes after render and after every update

  • Can be used to fetch data, subscribe to events, update the DOM, etc.

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Q4. What are the Security aspects?

Ans.

Security aspects include confidentiality, integrity, availability, authentication, and non-repudiation.

  • Confidentiality: Protecting sensitive information from unauthorized access.

  • Integrity: Ensuring data is not modified or tampered with.

  • Availability: Ensuring systems and data are accessible when needed.

  • Authentication: Verifying the identity of users or systems.

  • Non-repudiation: Preventing denial of actions or transactions.

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Q5. Are you familiar with SaaS product offering?

Ans.

Yes, SaaS stands for Software as a Service which is a cloud-based software delivery model.

  • SaaS products are accessed through the internet and do not require installation on local devices.

  • SaaS products are subscription-based and offer scalability and flexibility.

  • Examples of SaaS products include Salesforce, Dropbox, and Google Apps.

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Q6. react application working

Ans.

A React application is a web application built using the React JavaScript library for creating interactive user interfaces.

  • React applications are built using components, which are reusable pieces of code that represent a part of the user interface.

  • React uses a virtual DOM to efficiently update the actual DOM based on changes in the application state.

  • React applications can be created using tools like Create React App or by setting up a custom build configuration.

  • State manageme...read more

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