Nitor Infotech, an Ascendion company Senior Software Engineer Interview Questions and Answers

HashMap is a data structure that stores key-value pairs, allowing for efficient data retrieval based on keys.

• HashMap uses a hash function to compute an index (hash code) for each key.

• If two keys have the same hash code, they are stored in a linked list (or tree) at that index.

• Example: If keys 'cat' and 'act' have the same hash code, they will be stored together.

• HashMap allows for average O(1) time complexity for get an...read more

Annotations in Spring Boot simplify configuration and enhance code readability, enabling easier development and management of applications.

• @SpringBootApplication: Combines @Configuration, @EnableAutoConfiguration, and @ComponentScan for easy setup.

• @RestController: Indicates that a class is a controller where every method returns a domain object instead of a view.

• @Autowired: Automatically injects dependencies into Sprin...read more

Dependency Injection is a design pattern that allows for better code modularity and testing by injecting dependencies into classes.

• Dependency Injection (DI) promotes loose coupling between classes.

• It allows for easier unit testing by mocking dependencies.

• Common DI frameworks include Spring (Java) and Angular (JavaScript).

• Bean scope defines the lifecycle of beans in a Spring application: Singleton, Prototype, Request, S...read more

Effective exception handling ensures robust applications, while SOLID principles guide software design for maintainability and scalability.

• Try-Catch Blocks: Use try-catch blocks to handle exceptions gracefully, allowing the application to continue running or provide meaningful error messages.

• Custom Exceptions: Create custom exception classes to represent specific error conditions, improving clarity and control over err...read more

Node.js is a JavaScript runtime built on Chrome's V8 engine, enabling server-side scripting and asynchronous event-driven architecture.

• Node.js uses an event-driven, non-blocking I/O model, making it lightweight and efficient.

• It allows developers to use JavaScript on both the client and server sides, promoting code reuse.

• Node.js has a rich ecosystem of libraries and frameworks, such as Express.js for building web applic...read more

Vue.js lifecycle methods manage component creation, updating, and destruction, allowing developers to hook into these processes.

• created: Called after the instance is created, useful for data fetching.

• mounted: Invoked after the component is mounted to the DOM, ideal for DOM manipulations.

• updated: Triggered after data changes and the DOM is re-rendered, can be used for post-update actions.

• beforeDestroy: Called right befo...read more

Vue 3 introduces Composition API, improved performance, and better TypeScript support compared to Vue 2.

• Composition API: Vue 3 introduces the Composition API, allowing for better organization of code and reusability of logic. Example: Using 'setup()' function.

• Performance Improvements: Vue 3 is faster due to a more efficient virtual DOM and optimizations in reactivity.

• Fragment Support: Vue 3 allows components to return ...read more