400+ DMart Interview Questions and Answers

Three steps for using functions in C.

• Declare the function with its return type, name, and parameters.

• Define the function by writing the code for it.

• Call the function by using its name and passing arguments if necessary.

A stack is a data structure that follows the Last In First Out (LIFO) principle.

• Push: adds an element to the top of the stack

• Pop: removes the top element from the stack

• Peek: returns the top element without removing it

• IsEmpty: checks if the stack is empty

• Size: returns the number of elements in the stack

Method overloading is having multiple methods with the same name but different parameters. Method overriding is having a subclass method with the same name and parameters as a superclass method.

• Method overloading is used to provide different ways of calling the same method with different parameters.

• Method overriding is used to provide a specific implementation of a method in a subclass that is already defined in the superclass.

• Method overloading is resolved at compile-time ba...read more

Switch case is used for multiple conditions while if else is used for binary conditions.

• Switch case is faster than if else for multiple conditions.

• If else can handle complex conditions while switch case cannot.

• Switch case can only compare values of the same data type.

• If else can handle null values while switch case cannot.

• Example: switch (day) { case 1: console.log('Monday'); break; case 2: console.log('Tuesday'); break; default: console.log('Invalid day'); }

• Example: if (age ...read more

Sorting a list of strings based on their occurrence count.

• Create a dictionary to store the count of each string.

• Use the dictionary to sort the list based on the count of occurrences.

• If two strings have the same count, sort them alphabetically.

• Return the sorted list.

Swapping numbers without using a temporary variable

• Use addition and subtraction to swap the numbers

• Example: a = 5, b = 10. a = a + b (15), b = a - b (5), a = a - b (10)

• Alternatively, use bitwise XOR operation to swap the numbers

• Example: a = 5, b = 10. a = a ^ b (15), b = a ^ b (5), a = a ^ b (10)

Function overloading and overriding are concepts in object-oriented programming.

• Function overloading is when multiple functions with the same name but different parameters are defined in a class.

• Function overriding is when a derived class provides a different implementation for a method that is already defined in the base class.

• Overloading is resolved at compile-time based on the number, type, and order of arguments, while overriding is resolved at runtime based on the object...read more

Lists and tuples are both data structures in Python, but lists are mutable while tuples are immutable. OOP concepts include inheritance, encapsulation, and polymorphism. Decorators are used to modify functions or methods. Lambda functions are anonymous functions. Reduce, filter, generators, and iter objects are all related to functional programming in Python.

• Lists are mutable, meaning they can be changed after creation. Tuples are immutable, meaning they cannot be changed aft...read more

Java String program to replace characters, Encapsulation program, Comparator vs Comparable difference

• For Java String program to replace characters, use the replace() method to replace specific characters in a string.

• For Encapsulation in Java, use private access modifiers to restrict access to class variables and use public getter and setter methods to access and modify them.

• Comparator and Comparable are interfaces used for sorting objects in Java. Comparable is implemented by...read more

JavaScript is a dynamically typed language.

• Variables can hold different data types at different times

• Type checking is done at runtime

• Example: var x = 5; x = 'hello';

Random forest is an ensemble learning method that constructs a multitude of decision trees and outputs the mode of the classes. Gini impurity is a measure of impurity or randomness used in decision trees.

• Random forest is a collection of decision trees that are trained on different subsets of the data.

• Each decision tree in the forest is trained on a random subset of the features.

• The final prediction is made by taking the mode of the predictions of all the trees.

• Gini impurity i...read more

I have handled terabytes of data in my POCs, including data from various sources and formats.

• Handled terabytes of data in POCs

• Worked with data from various sources and formats

• Used tools like Hadoop, Spark, and SQL for data processing

The @Service annotation is used in Spring framework to indicate that a class is a service component.

• Used to mark a class as a service component in Spring framework

• Helps in auto-detection and auto-configuration of Spring beans

• Facilitates dependency injection and inversion of control

Apache normal restart stops and starts the server, while graceful restart allows current connections to finish before restarting.

• Normal restart stops and starts the server immediately, causing all active connections to be terminated.

• Graceful restart allows the server to continue serving current connections until they are finished, then starts a new instance of the server.

• Graceful restart is useful for minimizing downtime and avoiding disruption to users.

• Normal restart is fast...read more

C is a procedural programming language while C++ is an object-oriented programming language.

• C is a low-level language while C++ is a high-level language.

• C++ supports object-oriented programming concepts like classes, inheritance, and polymorphism.

• C++ has better support for exception handling and templates.

• C++ is more complex than C and requires more memory.

• C++ is used for developing applications like video games, while C is used for developing operating systems and system sof...read more

Yes, the core values of Sapient are People, Collaboration, Innovation, and Excellence.

• People - Putting people first, valuing diversity and inclusion

• Collaboration - Working together as a team, fostering open communication

• Innovation - Encouraging creativity, embracing new ideas and technologies

• Excellence - Striving for high quality, continuous improvement

I use a combination of project management software, spreadsheets, and communication tools to track my projects.

• Project management software: I utilize tools like Jira, Trello, or Asana to create and manage project tasks, assign responsibilities, and track progress.

• Spreadsheets: I use Excel or Google Sheets to create project timelines, track milestones, and monitor project budgets.

• Communication tools: I rely on tools like Slack or Microsoft Teams to collaborate with team member...read more

Algorithm to find missing number in a sequence

• Use mathematical formula for arithmetic or geometric sequence

• For random sequence, use sorting and iteration

• Consider edge cases like empty sequence or multiple missing numbers

Co-routines are lightweight because they are non-blocking and do not require a separate thread.

• Co-routines are cooperative, meaning they can pause and resume execution without blocking the thread.

• They use fewer resources than threads because they do not require a separate stack or context switch.

• Co-routines can be used to perform asynchronous operations without the overhead of creating and managing threads.

• Example: In Android, co-routines can be used to perform network reques...read more

Answering how to fetch data from API and display in UI list format for Reactjs Developer interview.

• Use fetch or axios to fetch data from API

• Store the data in state or Redux store

• Map through the data and display in UI list format

• Handle loading and error states

• Example: fetch('https://api.example.com/data').then(response => response.json()).then(data => setData(data))

• Example: {data.map(item =>

• {item.name}
)}

Use JavaScript to switch on and off a bulb with one button.

• Create a variable to store the state of the bulb (on/off)

• Add an event listener to the button

• Toggle the state of the bulb variable on each button click

• Update the bulb image or class based on the state of the bulb variable

SQL code to get the city1 city2 distance of table with repeating city1 and city2 values

• Use a self join on the table to match city1 and city2

• Calculate the distance between the cities using appropriate formula

• Consider using a subquery if needed

Interface and abstract class are both used for abstraction in object-oriented programming.

• An interface is a collection of abstract methods that define a contract for a class to implement.

• An abstract class is a class that cannot be instantiated and may contain abstract methods.

• Interfaces are used to achieve multiple inheritance in Java.

• Abstract classes can have non-abstract methods and instance variables.

• An example of an interface is the Comparable interface in Java.

• An example...read more

Program to add two numbers without using + operator

• Use bitwise operators like XOR, AND, and left shift

• Add the two numbers using bitwise operators and carry over the result

• Repeat until there is no carry over

Find the output of c=++a+b-- where a=5 and b=4.

• The value of a is incremented by 1 before the addition operation

• The value of b is decremented by 1 after the addition operation

• The final value of c is 10

• The value of a becomes 6 and the value of b becomes 3

Cluster is a group of processes that share the same resources while thread is a lightweight process that shares the same memory.

• Cluster is used for scaling and load balancing while thread is used for improving performance.

• Cluster can run on multiple machines while thread runs within a single process.

• Cluster requires inter-process communication while thread does not.

• Examples of cluster include PM2 and Node.js cluster module while examples of thread include worker threads in No...read more

To create a table using HTML, color one row, and merge specific columns, use <table>, <tr>, <td>, and <th> tags with CSS styling.

• Create a table using <table>, <tr>, <td>, and <th> tags

• Color one row using CSS by targeting the <tr> element with a specific class or inline style

• Merge specific columns using the colspan attribute in the <td> or <th> tags

Join in SQL is used to combine data from two or more tables based on a related column between them.

• Types of joins: Inner join, Left join, Right join, Full outer join, Cross join

• Syntax: SELECT * FROM table1 JOIN table2 ON table1.column = table2.column

• Example: SELECT * FROM customers JOIN orders ON customers.customer_id = orders.customer_id

I would approach the issue by communicating with all relevant teams and creating a plan to recover the lost data.

• Identify the cause of the data loss

• Notify all relevant teams and stakeholders

• Create a plan to recover the lost data

• Implement the plan and monitor progress

• Communicate updates to all stakeholders

Repartition increases the number of partitions in a DataFrame, while coalesce reduces the number of partitions without shuffling data.

• Repartition involves a full shuffle of the data across the cluster, which can be expensive.

• Coalesce minimizes data movement by only creating new partitions if necessary.

• Repartition is typically used when increasing parallelism or evenly distributing data, while coalesce is used for reducing the number of partitions without a full shuffle.

• Exampl...read more

Magento CMS is an e-commerce platform while WordPress is a content management system.

• Magento is specifically designed for e-commerce websites, while WordPress is more versatile and can be used for various types of websites.

• Magento offers advanced features for managing products, inventory, and payments, while WordPress focuses more on content creation and management.

• Magento has a steeper learning curve and requires technical expertise, while WordPress is more user-friendly and...read more

To manage drift in Terraform due to manually added services, use Terraform import, state management, and version control.

• Use Terraform import to bring manually added services under Terraform management.

• Regularly update Terraform state file to reflect the current state of infrastructure.

• Utilize version control to track changes made outside of Terraform.

• Implement automated checks to detect and reconcile drift in infrastructure.

A program to check if a given number is a palindrome or not.

• Convert the number to a string.

• Reverse the string and compare it with the original string.

• If they are equal, the number is a palindrome.

• If not, the number is not a palindrome.

Yes

• LiveData is lifecycle aware and can be used to observe changes in data.

• ViewModel provides a way to store and manage UI-related data across configuration changes.

• ViewModel can hold LiveData objects to provide data to the UI.

• LiveData and ViewModel work together to ensure data consistency and prevent memory leaks.

Answers to questions related to finance and IT industry

• DoR stands for Declaration of Readiness, which is a legal document that indicates a party's readiness to proceed with a legal action.

• Factoring is a financial transaction where a company sells its accounts receivable to a third party at a discount, while bill discounting is a short-term borrowing arrangement where a company borrows money from a bank by selling its bills before the due date.

• O2C cycle refers to the order-to-...read more

Yes, one can edit standard libraries of C.

• Standard libraries of C are typically provided as source code, allowing developers to modify them.

• Modifying standard libraries can be useful for fixing bugs, adding new features, or optimizing performance.

• However, it is generally recommended to avoid modifying standard libraries directly to maintain compatibility and portability.

• Instead, developers can create their own libraries or use existing third-party libraries for customization.

Designing/configuring a cluster for 10 petabytes of data involves considerations for storage capacity, processing power, network bandwidth, and fault tolerance.

• Consider using a distributed file system like HDFS or object storage like Amazon S3 to store and manage the large volume of data.

• Implement a scalable processing framework like Apache Spark or Hadoop to efficiently process and analyze the data in parallel.

• Utilize a cluster management system like Apache Mesos or Kubernet...read more

Explanation of OS, threading, paging, database transactions (ACID properties), and computer networks.

• OS (Operating System) is a software that manages computer hardware resources and provides services for computer programs.

• Threading involves the ability of a program to execute multiple parts concurrently.

• Paging is a memory management scheme that eliminates the need for contiguous allocation of physical memory.

• Database transactions follow ACID properties - Atomicity, Consistenc...read more

Sealed classes are used to restrict inheritance and provide a fixed set of subclasses.

• Sealed classes are used when we want to restrict the number of subclasses that can be created.

• They are useful when we have a fixed set of subclasses and we want to ensure that no other subclasses are created.

• Sealed classes can be used in conjunction with when expressions to provide exhaustive pattern matching.

• They are commonly used in Kotlin's own standard library, such as the Result class.

Comparator in Java 8 provides default methods and lambda expressions for sorting.

• Comparator in Java 8 can be implemented using lambda expressions.

• Comparator in Java 8 provides default methods like reversed() and thenComparing() for sorting.

• Comparator in pre-Java 8 versions can be implemented using anonymous inner classes.

• Comparator in pre-Java 8 versions requires more code to implement compared to Java 8.

• Example: Sorting a list of strings in ascending order using Java 8 Compa...read more

Answering questions related to Singleton classes, Rest API, repeating characters in a string, variable inheritance, and exception handling.

• Singleton classes are used to ensure that only one instance of a class is created and provide a global point of access to it.

• Rest API is a way of building web services that are lightweight, scalable, and maintainable.

• To find the repeating character in a string, we can use a hashmap to store the frequency of each character and then iterate ...read more

Repartition is used for increasing partitions for parallelism, while coalesce is used for decreasing partitions to reduce shuffling.

• Repartition is used when there is a need for more partitions to increase parallelism.

• Coalesce is used when there are too many partitions and need to reduce them to avoid shuffling.

• Example: Repartition can be used before a join operation to evenly distribute data across partitions for better performance.

• Example: Coalesce can be used after a filter...read more

Inheritance in Java allows a class to inherit properties and methods from another class.

• Inheritance is achieved using the 'extends' keyword.

• The class that is being inherited from is called the superclass or parent class.

• The class that inherits from the superclass is called the subclass or child class.

• Subclasses can access the public and protected members of the superclass.

• Inheritance promotes code reusability and allows for the creation of hierarchical relationships.

Common file formats used in data storages include CSV, JSON, Parquet, Avro, and ORC. Parquet is best for compression.

• CSV (Comma-Separated Values) - simple and widely used, but not efficient for large datasets

• JSON (JavaScript Object Notation) - human-readable and easy to parse, but can be inefficient for storage

• Parquet - columnar storage format that is highly efficient for compression and query performance

• Avro - efficient binary format with schema support, good for data serial...read more

This program generates a Fibonacci series up to a given length.

• Use an array to store the Fibonacci series

• Initialize the first two elements of the array as 0 and 1

• Use a loop to generate the subsequent elements of the series

• Stop the loop when the desired length is reached

DFD is typically documented in a Data Flow Diagram document.

• DFD is a visual representation of how data flows through a system.

• It shows the inputs, processes, and outputs of a system.

• DFD can be included in a requirements document or a system design document.

• It is important to keep the DFD up-to-date as the system evolves.

• Examples of tools used to create DFDs include Microsoft Visio and Lucidchart.

I have worked on various technologies including data analysis tools, project management software, and database management systems.

• Data analysis tools: Excel, Tableau, Power BI

• Project management software: JIRA, Trello

• Database management systems: SQL Server, Oracle

• Programming languages: Python, R

• Business intelligence tools: SAP BusinessObjects, QlikView

CI/CD process can be implemented for SFCC using Jenkins and Salesforce DX.

• Use Jenkins to automate the build and deployment process

• Use Salesforce DX to manage the source code and version control

• Create a pipeline in Jenkins to build, test and deploy the code

• Use Git for version control and create branches for each feature

• Use scratch orgs for testing and validation

• Automate the testing process using tools like Selenium or Provar

• Use continuous integration to ensure code quality and...read more

Controlled components are inputs whose value is controlled by React, while uncontrolled components are inputs whose value is controlled by the DOM.

• Controlled components are typically used in forms where the input value is controlled by React state.

• Uncontrolled components are often used for inputs that do not need to be controlled by React.

• Examples of controlled components include input fields with value and onChange props specified.

• Examples of uncontrolled components include ...read more

Reload refers to reloading the configuration without restarting the service, while restart refers to stopping and starting the service.

• Reload is a process of reloading the configuration of a service without stopping it completely.

• Restart is a process of stopping and starting the service completely.

• Reload is faster than restart as it does not require the service to be completely stopped.

• Reload is useful when making minor changes to the configuration, while restart is required ...read more

The ViewModel survives configuration changes by being retained by the system.

• ViewModels are designed to survive configuration changes like screen rotations or language changes.

• When an activity is destroyed and recreated, the ViewModel is not destroyed and retains its data.

• The ViewModel is associated with the activity's lifecycle and is retained until the activity is finished.

• The retained ViewModel instance can be accessed by the newly created activity to restore its state.

Angular routing, component life cycle hooks, directives, guards are key features of Angular framework.

• Angular routing is used to navigate between different components and views in an Angular application.

• Component life cycle hooks are methods that are called at different stages of a component's life cycle, such as OnInit, OnDestroy, etc.

• Directives are used to add behavior to HTML elements, such as ngIf, ngFor, etc.

• Guards are used to protect routes in an Angular application, su...read more

Implemented CICD process using Jenkins, Git, Docker and Kubernetes.

• Used Jenkins for continuous integration and continuous delivery

• Git for version control and code management

• Docker for containerization and portability

• Kubernetes for container orchestration and scaling

• Implemented automated testing and deployment pipelines

• Enabled faster and more reliable software delivery

• Reduced manual errors and increased efficiency

Data partitioning in a pipeline involves dividing data into smaller chunks for processing and analysis.

• Data can be partitioned based on a specific key or attribute, such as date, location, or customer ID.

• Partitioning helps distribute data processing tasks across multiple nodes or servers for parallel processing.

• Common partitioning techniques include range partitioning, hash partitioning, and list partitioning.

• Example: Partitioning sales data by region to analyze sales perform...read more

Data types are classifications of data that determine the type of values that can be stored and manipulated. Pointers are variables that store memory addresses.

• Data types include integers, floating-point numbers, characters, and booleans.

• Pointers are used to store memory addresses of variables or objects.

• Example: int num = 10; int *ptr = # // ptr stores the memory address of num

I want to work as a Java developer because of my passion for coding and problem-solving. In 5 years, I see myself leading a team and working on innovative projects.

• Passion for coding and problem-solving

• Opportunity to work on diverse projects

• Career growth and leadership opportunities

• Continuous learning and skill development

• Potential to work on innovative technologies

The coding exercise involves implementing a specific feature or functionality and writing unit tests to ensure its correctness.

• Explain the purpose of the coding exercise and what is expected to be implemented.

• Describe the approach taken to solve the problem and any challenges faced during implementation.

• Discuss the design decisions made and how they impact the overall code quality.

• Explain the unit tests written to validate the functionality of the implemented code.

• Provide exa...read more

ViewBag and ViewData are used to pass data from controller to view in MVC. ViewBag uses dynamic properties while ViewData uses dictionary.

• ViewBag is a dynamic object while ViewData is a dictionary object.

• ViewBag is a property of the Controller base class while ViewData is a property of the ViewDataDictionary class.

• ViewBag is used to pass data from controller to view while ViewData is used to pass data from controller to view and between views.

• Example of using ViewBag: ViewBag...read more

Microservice architecture allows for greater scalability and flexibility compared to monolith architecture.

• Microservices are smaller, independent components that can be developed and deployed separately

• Monoliths are a single, large application with tightly coupled components

• Microservices allow for easier maintenance and updates

• Monoliths can be simpler to develop and deploy initially

• Examples of microservice architecture include Netflix and Amazon

• Examples of monolith architectu...read more

Security groups are used to control inbound and outbound traffic for EC2 instances in AWS.

• Security groups act as virtual firewalls for EC2 instances.

• They allow or deny traffic based on rules defined by the user.

• They can be assigned to multiple instances.

• They are stateful, meaning they keep track of the traffic flow and allow the response traffic.

• They can be used to restrict access to specific ports or IP addresses.

• They are a fundamental component of AWS security.

• Example: A se...read more

Publicis Sapient has job locations in multiple cities across India.

• Publicis Sapient has offices in Bangalore, Gurgaon, Mumbai, and Chennai.

• They also have a presence in Noida, Hyderabad, and Jaipur.

• The company offers remote work options as well.

• Job locations may vary depending on the specific role and project.

Hosting in JS refers to the behavior of variable declarations being moved to the top of their containing scope during the compilation phase.

• Variable declarations are 'hoisted' to the top of their scope, regardless of where the actual declaration occurs.

• Only the declarations are hoisted, not the initializations.

• Example: var x; console.log(x); var x = 5; // Output: undefined

Python program to find the most repeating substring in a list of words.

• Iterate through each word in the list

• Generate all possible substrings for each word

• Count the occurrences of each substring using a dictionary

• Find the substring with the highest count

Sub components and qualifiers are used in Dagger 2 for modularization and dependency injection.

• Sub components allow for modularization of dependencies within a larger component.

• Qualifiers are used to differentiate between multiple dependencies of the same type.

• Sub components are created using the @Subcomponent annotation.

• Qualifiers are created using custom annotations with @Qualifier.

• Example: @Named("example") String exampleString;

• Example: @Subcomponent(modules = {ExampleModu...read more

To schedule a pod in a certain node in k8s, use nodeSelector in pod spec.

• Add a label to the node you want to schedule the pod on

• Specify the label in the pod spec using nodeSelector

• Example: nodeSelector: {key: value}

Tips for SQL query performance and optimization

• Use indexes to speed up query execution

• Avoid using SELECT * and only select necessary columns

• Use JOINs instead of subqueries

• Avoid using functions in WHERE clauses

• Use EXPLAIN to analyze query performance

• Normalize database tables to reduce redundancy

• Use stored procedures for frequently executed queries

Data security can be achieved through encryption, access controls, backups, and regular security audits.

• Encrypt sensitive data using strong encryption algorithms.

• Implement access controls to restrict unauthorized access to the data.

• Regularly backup the data to prevent data loss.

• Conduct regular security audits to identify and fix vulnerabilities.

• Use secure protocols and communication channels for data transfer.

• Implement secure coding practices to prevent common security vulner...read more

Singleton pattern in Spring ensures that a class has only one instance and provides a global point of access to it.

• In Spring, singleton pattern is used by default for all beans created through the Spring container.

• This means that by default, Spring beans are singletons and only one instance is created and shared throughout the application.

• To connect to a database in Spring, you can use the JDBC template or ORM frameworks like Hibernate.

• You can configure the database connectio...read more

NAT stands for Network Address Translation. It is used to translate private IP addresses to public IP addresses.

• NAT is used to allow devices with private IP addresses to access the internet using a public IP address.

• It can be configured on a router or firewall.

• There are three types of NAT: static, dynamic, and port forwarding.

• Static NAT maps a private IP address to a public IP address permanently.

• Dynamic NAT maps a private IP address to a public IP address temporarily.

• Port fo...read more

We are using CIDR block 10.0.0.0/16 in our VPC.

• Our VPC is using the private IP address range of 10.0.0.0/16

• This CIDR block allows us to have up to 65,536 IP addresses

• We have divided the VPC into multiple subnets using smaller CIDR blocks

Algorithm to find numbers from an integer array

• Iterate through the array and check each element

• If the element is a number, add it to a new array

• Return the new array with all the numbers

Yes, they are similar.

• All 8 metal balls are of the same material.

• They have the same size and weight.

• They have the same physical properties.

• They are interchangeable in any given situation.

SFRA architecture follows a modular approach with a clear separation of concerns.

• SFRA stands for Storefront Reference Architecture

• It is built on top of the SiteGenesis architecture

• It follows a modular approach with a clear separation of concerns

• It uses a combination of server-side and client-side technologies

• It provides a responsive design that works across multiple devices

• It includes pre-built cartridges for common functionality

• It allows for customization through the use of ...read more

Fetch cart items and display them

• Create a function to fetch cart items from database

• Display the items in the cart on the user interface

• Handle empty cart scenarios

• Consider pagination for large number of items

AEM is a content management system used for creating and managing digital content.

• AEM stands for Adobe Experience Manager.

• It is a comprehensive content management system that allows users to create, manage, and deliver digital content across multiple channels.

• AEM provides a user-friendly interface for content creation and editing, with features like drag-and-drop functionality and in-context editing.

• It offers robust capabilities for content personalization, targeting, and ana...read more

I have experience with various CMS tools.

• I have used WordPress, Drupal, and Joomla for website content management.

• I have also worked with Adobe Experience Manager (AEM) for enterprise-level CMS.

• I am familiar with HubSpot CMS for inbound marketing purposes.

• I have utilized Contentful and Prismic for headless CMS implementations.

• Additionally, I have experience with Shopify and WooCommerce for e-commerce CMS solutions.

Polymorphism is the ability of an object to take on many forms.

• It allows objects of different classes to be treated as if they were objects of the same class.

• It is achieved through method overriding and method overloading.

• Example: A shape class can have multiple subclasses like circle, square, etc. and all can be treated as shapes.

• Example: A method can have different implementations in different classes but with the same name and signature.

Design patterns are reusable solutions to common problems in software design. Some types include Singleton, Factory, Observer, and Strategy patterns.

• Singleton pattern ensures a class has only one instance and provides a global point of access to it.

• Factory pattern creates objects without specifying the exact class of object that will be created.

• Observer pattern defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notif...read more

Sfra uses caching to improve performance by storing frequently accessed data in memory.

• Sfra uses a caching framework called 'Cache' which is based on the Node.js 'lru-cache' package.

• Cache can store data in memory or on disk, and can be configured to expire data after a certain amount of time or when memory usage reaches a certain threshold.

• Sfra uses caching for various types of data, such as site preferences, product data, and customer data.

• Caching can be customized by develo...read more

A variable that is associated with a class rather than with instances of the class.

• Static variables are declared using the static keyword.

• They are initialized only once, at the start of the program execution.

• They retain their value throughout the program's execution.

• They can be accessed without creating an instance of the class.

• Example: public static int count = 0;

Member functions are functions that are defined inside a class and can access the class's private and protected members.

• Member functions are also known as methods.

• They can be used to manipulate the data members of an object.

• They can be overloaded, meaning multiple functions with the same name but different parameters can exist within a class.

• They can be declared as const, meaning they do not modify the object's state.

• Example: class Car { void start(); void stop(); };

• Example: ...read more

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 saves time and effort in writing new code.

• The existing class is called the parent or base class, and the new class is called the child or derived class.

• The child class inherits all the properties and methods of the parent class and can also add its own unique properties and methods.

• For example, a class 'An...read more

Spring is a framework for building Java applications, while Spring Boot is an extension that simplifies the setup and development process.

• Spring is a comprehensive framework that provides features like dependency injection, aspect-oriented programming, and more.

• Spring Boot is an extension of the Spring framework that simplifies the setup and development of Spring applications by providing defaults for configuration.

• Spring Boot includes embedded servers like Tomcat, Jetty, or ...read more

You can check the OS on which the Selenium program is running by using the 'System.getProperty()' method in Java.

• Use 'System.getProperty('os.name')' to get the name of the operating system

• Use 'System.getProperty('os.version')' to get the version of the operating system

• Use 'System.getProperty('os.arch')' to get the architecture of the operating system

Debouncing and throttling are techniques used in JavaScript to limit the number of times a function is called.

• Debouncing delays the execution of a function until a certain amount of time has passed without it being called again.

• Throttling limits the rate at which a function can be called, ensuring it is not called more than once within a specified time interval.

Accessibility refers to the design of products, devices, services, or environments for people with disabilities.

• ES6 introduced new concepts like let and const for variable declaration, arrow functions, template literals, destructuring, and classes.

• let and const are block-scoped variables, unlike var which is function-scoped.

• Arrow functions provide a shorter syntax for writing function expressions.

• Template literals allow for easier string interpolation and multiline strings.

• De...read more

Boolean search is a type of search that allows users to combine keywords with operators such as AND, OR, and NOT to produce more relevant results.

• Boolean search is commonly used in search engines and databases.

• It helps to narrow down search results by using specific keywords and operators.

• For example, searching for 'cats AND dogs' will only show results that include both keywords.

• On the other hand, searching for 'cats NOT dogs' will exclude any results that include the keywor...read more

Use the find command with the -mtime option to find files that are 30 days old in Linux.

• Use the find command with the -mtime option to specify the number of days.

• For example, to find files that are exactly 30 days old: find /path/to/directory -mtime 30

• To find files that are older than 30 days: find /path/to/directory -mtime +30

• To find files that are newer than 30 days: find /path/to/directory -mtime -30