10+ Tractors and Farm Equipment Interview Questions and Answers

State management libraries other than Redux

• MobX - simple and scalable state management

• Flux - unidirectional data flow architecture

• Vuex - state management for Vue.js

• Apollo Client - state management for GraphQL

• React Context API - built-in state management for React

• Recoil - experimental state management library for React

• XState - state management for finite state machines

SCD type 2 is a slowly changing dimension technique in data warehousing to track historical changes in data.

• SCD type 2 maintains historical data by creating new records for changes instead of updating existing records

• It includes effective start and end dates to track when a change occurred

• In PowerCenter, SCD type 2 can be implemented using the Update Strategy transformation and maintaining historical data in a separate table

Class components are ES6 classes while functional components are functions.

• Class components have state and lifecycle methods while functional components don't.

• Functional components are simpler and easier to read and test.

• Functional components are preferred for simple UI components while class components are used for complex UI components.

• Example of class component: class MyComponent extends React.Component {}

• Example of functional component: function MyComponent(props) {}

componentDidMount is called after the component is mounted while componentWillMount is called before the component is mounted.

• componentDidMount is used for fetching data from APIs and updating the state

• componentWillMount is used for setting the initial state and making preparations for rendering

• componentDidMount is called once while componentWillMount is called multiple times

• componentDidMount is used for DOM manipulation

• componentWillMount is considered legacy and should be av...read more

The project architecture follows a microservices-based approach with containerization using Docker and orchestration with Kubernetes.

• The project is divided into multiple microservices that communicate with each other through APIs.

• Each microservice is containerized using Docker to ensure consistency and portability.

• Kubernetes is used for orchestration to manage the deployment, scaling, and monitoring of the microservices.

• The architecture also includes a load balancer to distri...read more

setState is asynchronous

• setState schedules an update to a component's state

• The update may not happen immediately, but will be batched and executed later

• This can lead to unexpected behavior if not handled properly

Security tools for React applications

• Use ESLint and Prettier to enforce code quality and security standards

• Implement authentication and authorization using libraries like Passport.js and JSON Web Tokens

• Use security-focused libraries like Helmet to secure HTTP headers

• Implement input validation and sanitization using libraries like Joi and DOMPurify

• Use HTTPS to encrypt data in transit

• Implement rate limiting and other security measures to prevent attacks like CSRF and XSS

• Regular...read more

Regression testing is the process of retesting modified software to ensure that previously working functionalities are still intact.

• Regression testing is performed after making changes to software to identify any new defects or issues introduced.

• It helps ensure that existing functionalities are not affected by the changes.

• It involves rerunning previously executed test cases to verify if the software still behaves as expected.

• Regression testing can be done manually or using au...read more

MVC is a software design pattern that separates an application into three interconnected components: Model, View, and Controller.

• Model represents the data and business logic of the application

• View is responsible for rendering the user interface

• Controller handles user input and updates the model and view accordingly

• MVC promotes separation of concerns and modularity

• Examples of MVC frameworks include Ruby on Rails, Django, and ASP.NET MVC

Sanity testing is a subset of regression testing that quickly checks if the major functionalities of a software are working as expected.

• Sanity testing is a high-level testing approach

• It focuses on testing the core functionalities of a software

• It is performed after major changes or bug fixes

• It ensures that the software is stable enough for further testing

• It is a quick and shallow form of testing

• It helps in identifying critical defects early in the development cycle

State is mutable data owned by a component, while props are immutable data passed to a component.

• State can be changed by the component itself, while props cannot be changed by the component

• State is used to store data that can change over time, while props are used to pass data from parent to child components

• State is initialized in the constructor of a component, while props are passed down from the parent component

• Example: A counter component can use state to keep track of th...read more

Strict mode is a feature in React that helps with debugging and identifying potential issues.

• Enables additional checks and warnings during development

• Helps identify unsafe code and deprecated features

• Can be enabled globally or for specific components

• Example:

Yes, I am flexible with location and willing to relocate if required.

• I am open to working remotely or on-site

• I am willing to relocate for the right opportunity

• I have experience working with remote teams

Constructor and destructor are special member functions in a class that are used to initialize and destroy objects, respectively.

• Constructor is called when an object is created, used to initialize the object's data members.

• Destructor is called when an object goes out of scope or is explicitly deleted, used to release resources.

• Example: class Car { public: Car() { cout << 'Constructor called'; } ~Car() { cout << 'Destructor called'; } };

• Constructors can be overloaded with diff...read more

Axios is a promise-based HTTP client for making API requests in ReactJs.

• Axios is used to make HTTP requests from the client-side in ReactJs

• It supports all modern browsers and can be used with Node.js

• Axios can be used to make GET, POST, PUT, DELETE requests and more

• It can also handle request and response interceptors for global error handling and authentication

• Axios can be installed using npm or yarn

React is a JavaScript library for building user interfaces. Redux is a predictable state container for JavaScript apps.

• React is used for building reusable UI components

• Redux is used for managing the state of the application

• React and Redux are often used together in web development

• React uses a virtual DOM to efficiently update the UI

• Redux follows a unidirectional data flow pattern

Bulk load is faster for large amounts of data, while normal load is suitable for smaller amounts.

• Bulk load is more efficient for loading large amounts of data quickly.

• Normal load is better for smaller amounts of data to avoid overwhelming the system.

• Bulk load is commonly used for initial data migration or periodic batch updates.

• Normal load is used for real-time or incremental data updates.

• Examples: Bulk load - importing millions of records into a database. Normal load - updat...read more

Hooks are a feature in React that allow functional components to have state and lifecycle methods.

• 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 lifecycle methods

• Custom hooks can be created to reuse stateful logic across components