Newgen Software Technologies Senior Software Engineer Interview Questions and Answers

React is a library for building UI, while Angular is a full-fledged framework for web applications.

• React uses a virtual DOM for efficient rendering, while Angular uses a real DOM.

• React is component-based and focuses on UI, whereas Angular is a complete MVC framework.

• React allows for more flexibility and is often used with other libraries, while Angular provides a more opinionated structure.

• React uses JSX, a syntax...read more

Object-oriented programming (OOP) in Java is a paradigm based on objects that encapsulate data and behavior.

• Encapsulation: Bundling data and methods that operate on the data within one unit (class). Example: class 'Car' with attributes like 'color' and methods like 'drive()'.

• Inheritance: Mechanism to create a new class from an existing class, inheriting its properties. Example: class 'ElectricCar' extends 'Car'.

• Po...read more

SQL joins combine rows from two or more tables based on related columns, enabling complex queries and data retrieval.

• Use INNER JOIN to return records with matching values in both tables. Example: SELECT * FROM Orders INNER JOIN Customers ON Orders.CustomerID = Customers.CustomerID;

• LEFT JOIN returns all records from the left table and matched records from the right table. Example: SELECT * FROM Customers LEFT JOIN ...read more

Arrange characters in arrays by sorting or manipulating strings for various applications.

• Use built-in sorting functions: In Python, use sorted() to arrange strings alphabetically. Example: sorted(['banana', 'apple']) returns ['apple', 'banana'].

• Custom sorting: Implement a custom sort function to arrange strings based on specific criteria, like length or character frequency.

• Reversing strings: Use slicing to reverse...read more

OOP concepts include encapsulation, inheritance, polymorphism, and abstraction, forming the foundation of object-oriented programming.

• Encapsulation: Bundling data and methods that operate on the data within a single unit (class). Example: A class 'Car' with properties like 'speed' and methods like 'accelerate()'.

• Inheritance: Mechanism to create a new class from an existing class, inheriting its properties and meth...read more

Insert a node in the middle of a linked list

• Find the middle node using slow and fast pointers

• Insert the new node after the middle node

• Update the pointers to maintain the linked list structure

Reverse a linked list

• Iterate through the linked list and change the direction of pointers

• Use three pointers to keep track of current, previous, and next nodes

• Update the head of the linked list to point to the last node

React lifecycle, Fragment vs React.Fragment, React.PureComponent

• React lifecycle consists of mounting, updating, and unmounting phases

• Fragment is a shorthand for React.Fragment, used to group multiple elements

• React.PureComponent is a class component that implements shouldComponentUpdate method for performance optimization