Publicis Sapient Senior Software Engineer 1 Interview Questions and Answers

Q1. Node.js questions were asked
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Q2. Questions about the projects which i have worked
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Q1. What is abstract class
Ans. 
An abstract class is a class that cannot be instantiated and is used as a blueprint for other classes to inherit from.
• Cannot be instantiated directly

• May contain abstract methods that must be implemented by subclasses

• Can have both abstract and non-abstract methods

• Used to define common behavior for subclasses
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Q2. How to implement singleton pattern
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Singleton pattern ensures a class has only one instance and provides a global point of access to it.
• Create a private static instance variable of the class itself

• Make the constructor private to prevent instantiation from outside the class

• Provide a static method to access the singleton instance
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Technical coding coding test

Q1. OOPs spring jsis kss
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Q2. Oo idid jdid sjiss js
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Q1. What is view? What is cte
Ans. 
A view is a virtual table created by a query. CTE stands for Common Table Expression, which is a temporary result set.
• View is a saved SQL query that acts as a virtual table

• CTE is a temporary result set that can be referenced within a query

• Views can be used to simplify complex queries and provide a layer of abstraction

• CTEs are useful for recursive queries or when a result set needs to be referenced multiple times
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Q1. If fresher then based on topic taken in BE,if experienced then based on work in previous company
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Q1. Run time polymorphism code
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Q2. Linked list code
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Q3. Deep copy shallow copy differences
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Deep copy creates a new copy of an object with its own unique memory space, while shallow copy creates a new object that references the same memory locations as the original object.
• Deep copy duplicates all nested objects, while shallow copy only duplicates the references to nested objects.

• Deep copy ensures that changes to the copied object do not affect the original object, while shallow copy may lead to unintended sid...read more
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Q1. More deep questions about polymorphism code
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Q2. Code for interchange of strings without strcpy
Ans. 
Use a loop to swap characters of two strings without using strcpy function.
• Create two arrays of characters to store the strings

• Use a loop to iterate through each character of the strings and swap them

• Ensure to handle cases where strings have different lengths
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Q1. Architecture discussion around projects
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Q1. Caching, auth discussion in depth
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