Extramarks Education Front end Developer Interview Questions and Answers

DSA, React, JavaScript, Rest API, Redux, VUE js,

Q1. What is virtual DOM?
Ans. 
Virtual DOM is a lightweight copy of the actual DOM used for efficient updates.
• Virtual DOM is a concept used in React to improve performance.

• It is a lightweight copy of the actual DOM.

• It is used to minimize the number of updates needed to be made to the actual DOM.

• When a change is made to the virtual DOM, React compares it with the previous version and only updates the necessary changes to the actual DOM.

• This results i...read more
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Q2. What is Redux?How to implement Redux?
Ans. 
Redux is a predictable state container for JavaScript apps.
• Redux is a state management library for JavaScript applications.

• It helps in managing the state of an application in a predictable way.

• Redux follows a unidirectional data flow pattern.

• To implement Redux, we need to define actions, reducers, and a store.

• Actions are plain JavaScript objects that describe what happened.

• Reducers specify how the application's state c...read more
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Q1. Very good all angular related question
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Q2. Rxjs concepts subjects
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Q3. Angular life cycle hooks
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Q4. How to use fork join
Ans. 
Fork join is a technique used in parallel programming to divide a task into smaller subtasks and then combine the results.
• Fork join is commonly used in multi-threading or concurrent programming.

• It allows multiple threads to work on different parts of a task simultaneously.

• Once all the subtasks are completed, the results are combined to get the final result.

• Fork join can improve performance by utilizing the available re...read more
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Q5. RESTand SPREAD operators
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