Refract Consulting Software Developer Interview Questions and Answers

A database is a structured collection of data. One-to-one and one-to-many are types of relationships between entities in a database. SQL commands are used to interact with a database.

• A database is a system for storing and managing data.

• One-to-one relationship: Each record in one table is associated with only one record in another table.

• One-to-many relationship: Each record in one table is associated with multiple recor...read more

ReactJS is a popular JavaScript library for building user interfaces.

• ReactJS allows for reusable components, making development faster and more efficient.

• It uses a virtual DOM, which improves performance by minimizing updates to the actual DOM.

• ReactJS has a large and active community, providing support and resources for developers.

• It can be used for both web and mobile app development, with tools like React Native.

• Reac...read more

Functional components are stateless and rely on props, while class-based components have state and lifecycle methods.

• Functional components are written as functions and return JSX elements.

• Class-based components are written as ES6 classes and extend the React.Component class.

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

• Class-based components have access to lifecycle methods like componentDidMount ...read more