MasterCard Technical Lead Interview Questions and Answers

Props destructuring simplifies accessing props in React components, enhancing code readability and maintainability.

• Destructuring allows you to extract multiple properties from an object in a concise way.

• In React, you can destructure props directly in the function parameters: `const MyComponent = ({ prop1, prop2 }) => { ... }`.

• This approach reduces the need for repetitive code: instead of `props.prop1`, you can ...read more

app.use in .NET Core is used to add middleware to the request pipeline.

• app.use is a method used in ASP.NET Core to add middleware components to the request pipeline.

• Middleware components are software components that are executed in the request pipeline to handle requests and responses.

• Middleware components can perform tasks such as authentication, logging, error handling, and more.

• Example: app.use(new MiddlewareCo...read more

No, abstract classes cannot be instantiated.

• Abstract classes are meant to be inherited and extended by other classes.

• Attempting to instantiate an abstract class will result in a compilation error.

• Abstract classes can have abstract methods that must be implemented by the subclass.

Parent child component communication in React involves passing data from parent to child components and triggering events from child to parent components.

• Use props to pass data from parent to child components

• Use callback functions to trigger events from child to parent components

• Context API can be used for passing data to deeply nested components

Dependency injection is a design pattern in which components are given their dependencies rather than creating them internally.

• Dependency injection helps in achieving loose coupling between classes.

• It allows for easier testing by mocking dependencies.

• There are three types of dependency injection: constructor injection, setter injection, and interface injection.

• Example: Instead of a class creating an instance of an...read more

Optimizing a React application involves code splitting, lazy loading, minimizing bundle size, using memoization, and optimizing render performance.

• Implement code splitting to load only necessary code for each route or component.

• Utilize lazy loading to defer loading of non-essential components until they are needed.

• Minimize bundle size by removing unused code, optimizing images, and using tree shaking.

• Use memoizati...read more

Interface is a contract that defines the methods a class must implement, while abstract class can have both abstract and concrete methods.

• Interface cannot have any implementation, while abstract class can have both abstract and concrete methods.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Interfaces are used to achieve multiple inheritance in Java, while abstract classes a...read more

Micro service design patterns are architectural patterns used to design and implement microservices.

• Service discovery

• Circuit breaker

• API gateway

• Event sourcing

• Saga pattern