Oriserve Interview Questions, Process, and Tips

Q1. Asked about Javascripts output based questions and some questions of Mongo DB
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Q2. One question related to setTimeout output based whose answer was lying in hoisting of var
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Q1. I was asked show my project repos and then was asked about questions related to those code and mongo queries
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Q2. Agrregation pipeline in mongodb
Ans. 
Aggregation pipeline in MongoDB is a framework for data aggregation operations.
• Pipeline stages are used to process documents in a collection.

• Operators like $match, $group, $project are used in pipeline stages.

• Results can be transformed, sorted, grouped, and filtered using aggregation pipeline.

• Example: db.collection.aggregate([{$match: {field: value}}, {$group: {_id: '$field', count: {$sum: 1}}}, {$sort: {count: -1}}])
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Q1. Cant specify as per company policy
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Q2. Cant specify
Ans. 
The question was related to designing a scalable system for handling large amounts of data.
• Focus on distributed systems and scalability

• Consider using technologies like Hadoop, Spark, or Kafka

• Discuss strategies for data partitioning and replication
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Q1. Cant specify as per company policy
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Q1. DSA question of DP
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Q2. Backend and Database discussion
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Q1. What is react dom?
Ans. 
React DOM is a package that provides DOM-specific methods that can be used to render React components.
• React DOM is used to render React components in the DOM.

• It provides methods like ReactDOM.render() to render components.

• React DOM takes care of updating the DOM to match the React components.
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Q2. What is SPA and how is react SPA?
Ans. 
SPA stands for Single Page Application. React is a popular JavaScript library for building SPAs.
• SPA is a web application that loads a single HTML page and dynamically updates the page as the user interacts with it.

• React is a JavaScript library for building user interfaces, including SPAs.

• React uses a virtual DOM to efficiently update the UI without reloading the entire page.

• React Router is commonly used with React to h
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