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Eltus Mode Interview Questions and Answers

Updated 11 Nov 2024

Q1. how many columns can be created in table?

Ans.

The number of columns that can be created in a table depends on the database management system being used.

  • The limit varies depending on the DBMS

  • For MySQL, the limit is 4096 columns per table

  • For Oracle, the limit is 1000 columns per table

  • The number of columns can also be limited by the available memory and disk space

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Q2. Types of Design Patterns and explain any one

Ans.

Design patterns are reusable solutions to common software problems. One example is the Singleton pattern.

  • Creational patterns: Singleton, Factory, Abstract Factory, Builder

  • Structural patterns: Adapter, Bridge, Composite, Decorator, Facade, Flyweight, Proxy

  • Behavioral patterns: Chain of Responsibility, Command, Interpreter, Iterator, Mediator, Memento, Observer, State, Strategy, Template Method, Visitor

  • Singleton pattern ensures a class has only one instance, and provides a globa...read more

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Q3. Explain in details about Oops concepts

Ans.

OOPs concepts are the fundamental principles of object-oriented programming.

  • Encapsulation - binding data and functions together

  • Inheritance - creating new classes from existing ones

  • Polymorphism - ability of objects to take on multiple forms

  • Abstraction - hiding implementation details from users

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Q4. Which is master database

Ans.

Master database is the primary database that stores all the important data of an organization.

  • Master database is the central repository of all the important data of an organization

  • It is used to store and manage critical data such as customer information, financial data, and employee records

  • It is usually the most secure and highly available database in an organization

  • Examples of master databases include Oracle, SQL Server, and MySQL

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Q5. what are the data types in JS

Ans.

Data types in JavaScript include number, string, boolean, object, function, undefined, and null.

  • Number - represents numeric data, e.g. 10, 3.14

  • String - represents textual data, e.g. 'hello', '123'

  • Boolean - represents true or false values, e.g. true, false

  • Object - represents complex data structures, e.g. { key: 'value' }

  • Function - represents executable code, e.g. function() { }

  • Undefined - represents a variable that has not been assigned a value

  • Null - represents an intentional ...read more

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Q6. what are closures

Ans.

Closures are functions that have access to variables from their containing scope even after the scope has closed.

  • Closures allow functions to access variables from their outer function even after the outer function has finished executing.

  • They are commonly used in event handlers, callbacks, and asynchronous programming.

  • Closures help in maintaining state in functional programming.

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Q7. what is virtual DOM

Ans.

Virtual DOM is a lightweight copy of the actual DOM used for efficient updates in web development.

  • Virtual DOM is a concept used in frameworks like React to improve performance by minimizing actual DOM manipulations.

  • When changes are made to the virtual DOM, a comparison is done with the actual DOM to determine the minimal updates needed.

  • This approach reduces the number of costly DOM operations, resulting in faster rendering and improved user experience.

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Q8. write react code for counter

Ans.

React code for a simple counter

  • Create a functional component for the counter

  • Use useState hook to manage the count state

  • Render the count value and buttons to increment and decrement the count

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