Chetu Interview Questions, Process, and Tips for Freshers

Inheritance is a mechanism in object-oriented programming where a new class is created by inheriting properties of an existing class.

• Inheritance allows code reusability and promotes code organization.

• The existing class is called the parent or superclass, and the new class is called the child or subclass.

• The child class inherits all the properties and methods of the parent class and can also add new properties and metho...read more

The question is unclear and lacks context.

• Please provide more information or rephrase the question.

• Without context, it is difficult to understand what is being asked.

• It is important to communicate clearly in technical interviews.

Routing is used to direct network traffic efficiently and securely.

• Routing helps to find the best path for data packets to travel.

• It enables load balancing and fault tolerance.

• Routing protocols like OSPF, BGP, and EIGRP are used to manage routing tables.

• Routing can be static or dynamic depending on the network requirements.

Thunk and saga are middleware libraries used in Redux for handling asynchronous actions.

• Thunk is a function that wraps an expression to delay its evaluation.

• Saga is a generator function that allows for complex control flow and error handling.

• Thunk is simpler and easier to use, while Saga is more powerful and flexible.

• Example: Thunk can be used to dispatch an action after an API call is complete.

• Example: Saga can be use...read more

Life cycle methods are functions that are called at different stages of a component's life cycle in React.

• There are three categories of life cycle methods: mounting, updating, and unmounting.

• Mounting methods are called when a component is being created and inserted into the DOM.

• Updating methods are called when a component's state or props change.

• Unmounting methods are called when a component is being removed from the D...read more

foreach is used to iterate over an array and perform an action on each element, while map creates a new array by applying a function to each element of an existing array.

• foreach does not return a new array, while map does

• foreach can only perform an action on each element, while map can transform each element

• foreach is useful for performing side effects, while map is useful for creating a new array with transformed elem

An interface is a contract that specifies the methods and properties that a class must implement.

• An interface defines a set of methods and properties that a class must implement

• Interfaces are used to achieve abstraction and polymorphism

• Interfaces can be used to define contracts between different parts of a system

• A class can implement multiple interfaces

• Example: The IDisposable interface in C# is used to ensure that an ...read more

Delete removes specific rows while truncate removes all rows from a table.

• Delete is a DML command while truncate is a DDL command.

• Delete is slower than truncate as it logs each row deletion while truncate only logs the deallocation of data pages.

• Delete can be rolled back while truncate cannot be rolled back.

• Delete can have a WHERE clause to specify which rows to delete while truncate removes all rows.

• Delete does not re...read more

Sealed classes are classes that cannot be inherited and are used to restrict class hierarchy.

• Sealed classes are declared using the 'sealed' keyword.

• They can have abstract members but cannot be instantiated.

• They are useful in creating exhaustive when expressions.

• They restrict the inheritance hierarchy and prevent unintended subclassing.

• Example: sealed class Shape { abstract fun draw() }

Union combines and removes duplicates while Union All combines all rows.

• Union is used to combine the result sets of two or more SELECT statements into a single result set with no duplicates.

• Union All is used to combine the result sets of two or more SELECT statements into a single result set with all rows.

• Union is slower than Union All because it has to remove duplicates.

• Union requires that the number and order of colu...read more

Abstract class is a class that cannot be instantiated and can only be inherited by other classes.

• An abstract class can have abstract and non-abstract methods.

• Abstract methods have no implementation and must be implemented by the child class.

• Non-abstract methods can have implementation and can be inherited by the child class.

• An abstract class can have constructors and variables.

• Example: abstract class Animal { abstract

Primary key uniquely identifies a record while foreign key refers to a primary key in another table.

• Primary key is a column or set of columns that uniquely identifies a record in a table

• Foreign key is a column or set of columns that refers to a primary key in another table

• Primary key cannot have null values while foreign key can have null values

• Primary key is used to enforce data integrity while foreign key is used to