Aquera Angular Developer Interview Questions and Answers

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 date pipe, currency pipe, and uppercase/lowercase pipe

I use Java version 8 for Angular development.

• I use Java 8 for its compatibility with Angular frameworks and libraries.

• Java 8 introduced features like lambda expressions and streams which are useful in Angular development.

• Example: I use Java 8 to write backend services for my Angular applications.

Java 8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods.

• Lambda expressions allow you to write code in a more concise and readable way.

• Functional interfaces provide a way to define interfaces with a single abstract method.

• Streams allow you to process collections of objects in a functional style.

• Default methods allow you to add new methods to interfaces wit

I have 5 years of experience in developing web applications using Angular.

• Developed responsive web applications using Angular framework

• Implemented RESTful APIs to fetch and update data

• Worked on optimizing performance and improving user experience

• Collaborated with UI/UX designers to create visually appealing interfaces

A directive in Angular is a class with a @Directive decorator that allows you to attach behavior to elements in the DOM.

• Directives are used to manipulate the DOM, add behavior to elements, and create reusable components.

• There are three types of directives in Angular: Component, Structural, and Attribute directives.

• Examples of directives include ngIf, ngFor, and ngStyle.

Components can communicate using @Input and @Output decorators, services, and event emitters.

• Use @Input decorator to pass data from parent to child component

• Use @Output decorator and EventEmitter to emit events from child to parent component

• Use services to share data between components

Using a shared service to communicate data between unrelated components in Angular.

• Create a shared service with a BehaviorSubject to store and emit data

• Inject the shared service into both components that need to share data

• Subscribe to the BehaviorSubject in each component to receive updates

Lazy loading in Angular allows for loading modules only when they are needed, improving performance.

• Lazy loading is achieved by using the loadChildren property in the route configuration.

• Modules are loaded asynchronously when the user navigates to a route that requires them.

• Lazy loading helps reduce the initial bundle size and improve the app's loading time.

• Example: { path: 'admin', loadChildren: () => import('./admin/

Prevent XSS vulnerability by sanitizing user input, using Angular's built-in security features, and implementing Content Security Policy.

• Sanitize user input by using Angular's DomSanitizer to prevent execution of malicious scripts

• Use Angular's built-in security features like SafeValue and SafeHtml to securely render user input

• Implement Content Security Policy (CSP) to restrict the sources from which scripts can be load...read more

Use observables and combineLatest operator to fetch data from multiple services in a component

• Create observables for each service call

• Use combineLatest operator to combine the observables and fetch data from all services at once

• Subscribe to the combined observable to get the data

Types of data binding in Angular include one-way binding, two-way binding, and event binding.

• One-way binding: Data flows in one direction from the component class to the template. Example: {{ data }}

• Two-way binding: Data flows in both directions between the component class and the template. Example: [(ngModel)]

• Event binding: Allows you to listen for and respond to user events in the template. Example: (click)

Bootstrap provides a responsive grid system, pre-designed components, and customizable themes for faster and easier web development.

• Responsive grid system allows for easy layout adjustments for different screen sizes

• Pre-designed components like buttons, forms, and navigation bars save time and effort in coding

• Customizable themes help in creating a consistent and visually appealing design

• Bootstrap also offers JavaScript...read more

Building blocks of Angular include components, modules, services, directives, templates, and dependency injection.

• Components are the basic building blocks of Angular applications.

• Modules help organize the application into cohesive blocks of functionality.

• Services are reusable code that can be injected into components.

• Directives add behavior to the DOM elements.

• Templates define the view of the application.

• Dependency inj...read more

Pipes in Angular are used to transform data before displaying it in the view.

• Pipes are used to format data in templates.

• There are built-in pipes like DatePipe, UpperCasePipe, LowerCasePipe, etc.

• Custom pipes can be created using @Pipe decorator.

• Pipes can be chained together for complex transformations.

• Example: {{ birthday | date:'dd/MM/yyyy' }} will format the birthday date.