Greenovative Energy Interview Questions and Answers

Yes, a service file can have more than one instance by creating multiple instances of the service class.

• Multiple instances of a service class can be created by instantiating the class multiple times.

• Each instance will have its own state and can be used independently.

• This can be useful for scenarios where multiple instances of the same service are needed to handle different tasks.

The new Angular feature that doesn't use @NgModule is called Ivy.

• Ivy is the new rendering engine in Angular that doesn't rely on @NgModule for compilation.

• It allows for faster compilation times and smaller bundle sizes.

• Ivy enables features like improved tree shaking and better debugging capabilities.

• Example: Angular 9 introduced Ivy as the default rendering engine.

The application would not work properly without @NgModule as it is required to bootstrap the application and configure dependencies.

• Without @NgModule, the application would not be able to bootstrap and start properly.

• NgModule is used to configure dependencies, such as components, directives, and services.

• NgModule also helps in organizing the application into modules for better maintainability and reusability.

To make an application scalable, consider using cloud services, optimizing database queries, caching frequently accessed data, and using microservices architecture.

• Utilize cloud services like AWS or Azure for scalability on demand

• Optimize database queries to improve performance

• Implement caching mechanisms for frequently accessed data to reduce load on servers

• Use microservices architecture to break down the application into smaller, independent services that can be scaled indi...read more

Types of directives in Angular include structural directives, attribute directives, and component directives.

• Structural directives are used to add or remove elements from the DOM based on conditions (e.g. *ngIf, *ngFor)

• Attribute directives are used to change the appearance or behavior of an element (e.g. ngStyle, ngClass)

• Component directives are custom directives that are components themselves (e.g. @Component)

Pipes in Angular are used for transforming data in templates.

• Pipes are used to format data before displaying it in the view.

• They can be used to filter, sort, or transform data in various ways.

• Examples include currency, date, uppercase, and lowercase pipes.

Methods for communication between components in Angular include Input and Output properties, ViewChild, Services, and EventEmitters.

• Using Input and Output properties to pass data from parent to child components and emit events from child to parent components.

• Using ViewChild to access child components and their properties directly from the parent component.

• Using Services to create a shared service that can be injected into multiple components to share data and functionality.

• Us...read more