Oriserve Interview Questions, Process, and Tips

Q1. Duplicate element in array
Ans. 
Find and return the duplicate element in an array of strings.
• Iterate through the array and keep track of elements seen so far using a hash set.

• If an element is already in the hash set, return it as the duplicate element.

• Example: ['apple', 'banana', 'apple', 'orange'] should return 'apple' as the duplicate element.
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Q2. Async await in js
Ans. 
async await in JavaScript is a way to write asynchronous code in a synchronous manner.
• async functions return a Promise

• await keyword is used to pause the execution of async functions until a Promise is settled

• async/await makes asynchronous code easier to read and write compared to using callbacks or Promises
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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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Palindrome question asked to solved in 10 minutes

Q1. Normal hr question
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Q2. Why you want to join
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