Pactera Edge Full Stack Developer Interview Questions and Answers

Q1. What is React, and what are its lifecycle methods?
Ans. 
React is a JavaScript library for building user interfaces.
• React is used for creating interactive UI components.

• It uses a virtual DOM for efficient rendering.

• React lifecycle methods include componentDidMount, componentDidUpdate, and componentWillUnmount.

• These methods allow developers to perform actions at specific points in a component's lifecycle.
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Q2. What is the virtual DOM and how does reconciliation work in it?
Ans. 
Virtual DOM is a lightweight copy of the actual DOM used for efficient updates. Reconciliation is the process of updating the actual DOM based on changes in the virtual DOM.
• Virtual DOM is a lightweight copy of the actual DOM kept in memory.

• When changes are made to the UI, they are first reflected in the virtual DOM.

• Reconciliation is the process of comparing the virtual DOM with the actual DOM and updating only the nece...read more
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Q1. Oops concept and the basic programming language knowledge
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Q2. Database queries and the database types
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Database queries are used to retrieve data from databases. There are different types of databases such as relational, NoSQL, and graph databases.
• Relational databases use SQL for querying data

• NoSQL databases use different query languages such as MongoDB's query language

• Graph databases use graph traversal languages such as Cypher

• Queries can be used to retrieve specific data or perform complex operations such as joins and
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Q1. Tell me about yourself
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Q2. Tell me about the project
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Q1. Salary discussion and dreams
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Online aptitude test in which verbal logic coding part include

Q1. Most on resume ,pattern.project
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Q1. Hr questions,yourself , strength , weakness ,etc
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Aptitude aptitude aptitude, coding, apti

Q1. Technical coding in c cpp java
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Q1. Project based backend and frontend
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Q2. How to connect to backend
Ans. 
To connect to the backend, you can use APIs, database connections, or web services.
• Use APIs to send and receive data between the frontend and backend

• Establish database connections to retrieve and store data

• Utilize web services for communication between different systems
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Q1. Pagination based react question
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Q2. JavaScript core concept
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Q1. General HR questions also a little bit about my experience
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Q1. .net general questions like ref vs out, interface vs abstract class
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Q1. 1.Tell me about your self 2.Where do you se yourself after 5 years 3.About projects and intership 4.one coding question in python
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Q1. Binary search implementation
Ans. 
Binary search is a fast search algorithm that finds the position of a target value within a sorted array.
• Binary search works by repeatedly dividing the search interval in half.

• It compares the target value with the middle element of the array.

• If the target value is equal to the middle element, the position is found.

• If the target value is less than the middle element, the search continues on the lower half of the array.

• I...read more
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Q2. Quick sort code implementation
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Quick sort is a popular sorting algorithm that uses divide and conquer strategy.
• Divide the array into two sub-arrays based on a pivot element

• Recursively sort the sub-arrays

• Combine the sorted sub-arrays to get the final sorted array
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