20+ Havas Media Interview Questions and Answers

React has three lifecycle methods: Mounting, Updating, and Unmounting.

• Mounting: When a component is being inserted into the DOM. componentDidMount() is an example.

• Updating: When a component is being re-rendered. componentDidUpdate() is an example.

• Unmounting: When a component is being removed from the DOM. componentWillUnmount() is an example.

• I have implemented these methods in various projects, such as using componentDidMount() to fetch data from an API and componentDidUpdate...read more

Node is single threaded for simplicity and consistency. Multi-threading can be achieved through child processes or worker threads.

• Node's single thread model simplifies programming and avoids race conditions.

• Child processes can be used to run multiple instances of Node, each with its own thread.

• Worker threads can be used to create additional threads within a single Node process.

• Multi-threading can improve performance for CPU-bound tasks, but may not be necessary for I/O-bound ...read more

Redux is a state management library for JavaScript applications. Middleware is a function that sits between the action and reducer. Redux components are React components that are connected to the Redux store.

• Redux is used to manage the state of an application in a predictable way.

• Middleware is used to intercept and modify actions before they reach the reducer.

• Redux components are React components that are connected to the Redux store using the 'connect' function.

• Examples of m...read more

DBMS allows fetching data from multiple tables using JOIN clause.

• Use JOIN clause to combine data from multiple tables based on a common column

• Types of JOINs include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN

• Specify the columns to be fetched using SELECT statement

• Use WHERE clause to filter the data based on specific conditions

Static binding is resolved at compile-time while dynamic binding is resolved at runtime.

• Static binding is also known as early binding.

• Dynamic binding is also known as late binding.

• Static binding is faster than dynamic binding.

• Examples of static binding include overloaded methods and constructors.

• Examples of dynamic binding include virtual functions and abstract classes.

Node is a JavaScript runtime built on Chrome's V8 JavaScript engine.

• Node allows developers to run JavaScript on the server-side.

• It has a non-blocking I/O model that makes it efficient for handling large amounts of data.

• Node has a package manager called npm that makes it easy to install and manage third-party libraries.

• Some popular frameworks built on Node include Express, NestJS, and Meteor.

ALE is a technology used for exchanging business data between different systems within an organization, while EDI Idoc is a specific format used for exchanging data between different systems outside an organization.

• ALE (Application Link Enabling) is used for communication within an organization's systems.

• EDI (Electronic Data Interchange) Idoc is a specific format used for exchanging data between different systems outside an organization.

• ALE is real-time data exchange, while E...read more

To prepare PR00 report output, follow these steps

• Run transaction code PR00 in SAP system

• Enter the necessary selection criteria such as company code, fiscal year, etc.

• Execute the report to generate the output

• Review the report output for accuracy and completeness

Error boundary is a React component that catches JavaScript errors during rendering.

• It is used to handle errors that occur during rendering in React applications.

• It helps to prevent the entire application from crashing due to a single error.

• It is implemented using the componentDidCatch lifecycle method.

• It can be used to display a fallback UI or log the error for debugging purposes.

Credit management involves assessing and managing credit risk, while rebate process involves providing discounts or refunds to customers.

• Credit management involves evaluating the creditworthiness of customers before extending credit

• It also involves setting credit limits, monitoring credit utilization, and managing collections

• Rebate process involves offering discounts or refunds to customers based on certain criteria, such as volume of purchases or meeting sales targets

• It is i...read more

Subrogation is the process by which an insurance company seeks reimbursement from the party at fault for a claim it has already paid out.

• Subrogation allows insurance companies to recover costs from responsible parties.

• It is commonly used in cases where a third party is liable for damages or injuries covered by an insurance policy.

• For example, if your car is damaged in an accident caused by another driver, your insurance company may seek reimbursement from the at-fault driver'...read more

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

• Virtual DOM is a concept used in ReactJS and other modern web frameworks.

• It allows for efficient updates by only updating the parts of the actual DOM that have changed.

• Virtual DOM is a tree-like structure that represents the actual DOM.

• Changes made to the virtual DOM are compared to the previous version to determine what needs to be updated in the actual DOM.

• This results in fast...read more

Object cloning is creating a copy of an object with the same state and behavior.

• Cloning can be shallow or deep, depending on whether the object's references are also copied.

• Java provides a clone() method for cloning objects.

• Cloning can be used to create backups, prototypes, and to avoid sharing mutable objects.

• Cloning can be expensive and error-prone, especially for complex objects.

• Immutable objects do not need to be cloned.

React hooks are a way to use state and other React features in functional components.

• Hooks were introduced in React 16.8.

• useState is a hook that allows functional components to have state.

• useEffect is a hook that allows functional components to have side effects.

• useContext is a hook that allows functional components to consume context.

• Hooks can only be used in functional components, not in class components.

• Example: const [count, setCount] = useState(0);

• Example: useEffect(() =...read more

Polymorphism is the ability of a single function or method to operate on different types of data.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: Inheritance in object-oriented programming languages like Java allows for polymorphism.

API stands for Application Programming Interface. There are mainly two types of APIs - REST and SOAP.

• APIs allow different software applications to communicate with each other

• REST APIs use HTTP requests to access and manipulate data

• SOAP APIs use XML messaging to exchange data

• Other types of APIs include GraphQL, RPC, and Webhooks

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

• C is a subset of C++

• C++ supports classes and objects, while C does not

• C++ has features like inheritance, polymorphism, and encapsulation which are not present in C

• C++ has a more complex syntax compared to C

• C++ has a standard template library (STL) for data structures and algorithms

Provisioning is the process of setting up and configuring resources for a user or system.

• Provisioning involves allocating resources such as hardware, software, and network access to users or systems.

• It can also involve configuring settings and permissions for these resources.

• Examples of provisioning include setting up a new employee with a computer, email account, and access to company software.

• Cloud service providers often offer self-service provisioning, allowing users to q...read more

OTC process refers to the steps involved in the over-the-counter sale of products directly to consumers without a prescription.

• OTC products are medications or other healthcare items that can be purchased without a prescription from a healthcare professional.

• Consumers can buy OTC products directly from pharmacies, supermarkets, or online retailers.

• OTC process involves product selection, payment, and dispensing of the product to the consumer.

• Examples of OTC products include pai...read more