10+ Xpertiz Interview Questions and Answers

I have extensive experience with database management systems.

• Proficient in SQL and NoSQL databases

• Designed and implemented database schemas

• Optimized database performance through indexing and query optimization

• Experience with MySQL, MongoDB, and PostgreSQL

• Familiarity with data warehousing and ETL processes

To ensure accurate estimates for a project, I follow these steps:

• Gather all project requirements and specifications

• Break down the project into smaller tasks

• Estimate the time required for each task

• Consider any potential roadblocks or delays

• Factor in any additional time for testing and revisions

• Review and adjust estimates as needed throughout the project

I use a variety of programming languages depending on the project requirements.

• I am proficient in JavaScript and use it for front-end development.

• For back-end development, I use languages like PHP, Python, and Ruby.

• I also have experience with SQL for database management.

• I am constantly learning new languages and technologies to stay up-to-date with industry trends.

Event loop in JS manages the execution of code and handles asynchronous tasks.

• JS is single-threaded, so event loop helps manage tasks without blocking the main thread.

• Asynchronous programming allows non-blocking execution of code.

• Callbacks, Promises, and Async/Await are common ways to handle asynchronous tasks.

• Example: setTimeout() function uses event loop to execute code after a specified delay.

PHP is a server-side scripting language used for web development.

• PHP is used to create dynamic web pages and web applications.

• It can interact with databases, handle forms, and manage sessions.

• PHP can be embedded into HTML code.

• Popular websites like Facebook, Wikipedia, and WordPress use PHP.

A superclass is a class from which other classes inherit properties and methods.

• Superclass is also known as a parent class.

• Subclasses inherit attributes and behaviors from the superclass.

• Superclass promotes code reusability and helps in organizing code.

PHP is a server-side scripting language used for web development. A simple program in PHP is a basic script that performs a specific task.

• PHP is widely used for creating dynamic web pages and applications.

• A simple PHP program can be used to display the current date and time on a webpage.

• PHP programs are written within tags and can be embedded within HTML code.

• PHP supports various data types, control structures, and functions for performing different operations.

• PHP programs c...read more

An object is a data structure that contains properties and methods.

• Objects are instances of classes in object-oriented programming.

• Properties are key-value pairs that define the characteristics of the object.

• Methods are functions that can be called on the object to perform actions.

• Example: An object representing a car could have properties like 'color' and 'model' and methods like 'start' and 'stop'.

A class is a blueprint for creating objects in object-oriented programming.

• Classes define the properties and behaviors of objects.

• Objects are instances of classes.

• Classes can inherit properties and behaviors from other classes.

• Example: class Car { // properties and methods }

A constructor is a special method used to initialize objects in a class.

• Constructors have the same name as the class they belong to

• They are called automatically when an object is created

• They can initialize object properties and perform other setup tasks

CSS is a styling language used to describe the look and formatting of a document written in HTML.

• CSS stands for Cascading Style Sheets.

• It is used to control the layout and appearance of web pages.

• CSS separates the content of a webpage from its presentation.

• It allows developers to apply styles to HTML elements, such as changing colors, fonts, sizes, and positioning.

• CSS can be written inline, embedded within HTML, or in an external file.

• Selectors are used to target specific ele...read more