Top 150 Angular Interview Questions and Answers

Components, modules, and services are different parts of a software system with specific functionalities.

• Components are reusable and independent parts of a system, often encapsulating a specific functionality.

• Modules are larger units of code that gro...read more

JS is a scripting language used for web development. Angular is a JS framework for building web applications.

• JS is used for adding interactivity to web pages

• JS has data types like string, number, boolean, etc.

• Angular is a framework for building singl...read more

Pipes in Angular are used for transforming data in templates.

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

• Angular provides built-in pipes like date, currency, uppercase, lowercase, etc.

• Custom pipes can also be created for specific f...read more

Router in Angular is used for navigation between different components and views.

• Angular Router is a powerful tool for building single-page applications

• It allows you to define routes, which are URL patterns that map to specific components

• You can use r...read more

Signals in Angular are used to communicate between components or services.

• Signals in Angular are typically implemented using Observables or Subjects.

• They allow components to subscribe to changes and react accordingly.

• Signals can be used to pass data,...read more

Deep dive into .NET Core and Angular

• NET Core is a cross-platform, open-source framework for building modern, cloud-based, internet-connected applications.

• Angular is a popular front-end framework for building dynamic web applications.

• Understanding the...read more

Lazy loading in Angular is a technique used to load modules only when they are needed.

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

• Lazy loaded modules are loaded asynchronously when the user navigates to the ...read more

I integrated Angular code with ASP.NET Core using Angular CLI to generate components and services, and then integrating them into ASP.NET Core project.

• Used Angular CLI to generate components and services

• Integrated Angular code into ASP.NET Core proje...read more

Node.js and Angular work together to create a seamless workflow for backend development.

• Node.js is used for server-side scripting and handling backend logic.

• Angular is used for client-side scripting and creating dynamic web applications.

• Node.js can s...read more

Template driven forms are easier to create and maintain, while reactive forms offer more flexibility and control.

• Template driven forms are created using directives in the template, while reactive forms are created programmatically in the component cl...read more

ngOnChanges is a lifecycle hook in Angular that is called when input properties of a component change.

• ngOnChanges is used to respond to changes in input properties of a component

• It receives a SimpleChanges object as an argument, which contains the pr...read more

Constructors initialize class members, while ngOnInit is a lifecycle hook for component initialization in Angular.

• Constructors are used to create and initialize an object when a class is instantiated.

• ngOnInit is a lifecycle hook that is called after ...read more

Angular lifecycles are methods that are called at specific points during the life of a component or directive.

• Angular components have lifecycle hooks that allow you to tap into key moments in the component's lifecycle, such as creation, updates, and ...read more

Angular Bootstrap is a front-end framework that combines Angular and Bootstrap to create responsive web applications.

• Angular Bootstrap is a library that allows developers to easily integrate Bootstrap components into Angular applications.

• It provides ...read more

Lazy loading is a technique used to load only the required modules/components on demand.

• It improves the performance of the application by reducing the initial load time.

• It is achieved by using the loadChildren method in the routing configuration.

• Lazy...read more

The basic building blocks of Angular are components, templates, directives, services, and dependency injection.

• Components are the building blocks of Angular applications

• Templates define how components are rendered

• Directives add behavior to elements i...read more

React is better than Angular due to its flexibility, performance, and community support.

• React allows for more flexibility in terms of architecture and state management compared to Angular.

• React's virtual DOM leads to better performance by only updati...read more

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 BehaviorSub...read more

Constructor is used to initialize class properties, NgOnInit() is a lifecycle hook used to perform initialization after Angular has initialized the component.

• Constructor is a TypeScript feature used to create and initialize class properties.

• NgOnInit(...read more

Input and output are used to pass data between components in Angular.

• Input is used to pass data from parent component to child component.

• Output is used to emit events from child component to parent component.

• Input and Output are defined using decorat...read more

ng-getValue is not a standard attribute in Angular. It may be a custom directive or a typo.

• Check if ng-getValue is a custom directive or attribute in your Angular application

• Verify if it is being used correctly in the HTML template

• If it is a typo, co...read more

Angular components are reusable building blocks for creating user interfaces in Angular applications.

• Angular components are classes that are responsible for controlling a part of the UI.

• They consist of a TypeScript class and an HTML template.

• Componen...read more

Attribute directives in Angular are used to modify the behavior or appearance of an element.

• Attribute directives are used to change the behavior or appearance of an element based on the value of an attribute.

• They are denoted by square brackets [] in ...read more

Angular pipe is a feature that allows transforming data before displaying it in the view.

• Pipes are used to format, filter, and transform data.

• They can be used in interpolation, property binding, and directive binding.

• Built-in pipes include DatePipe, ...read more

Template driven forms are based on directives while reactive forms are based on reactive programming.

• Template driven forms are easier to use and require less code.

• Reactive forms are more flexible and allow for more complex validation.

• Template driven ...read more

Angular is a complete rewrite of AngularJS with improved performance and features.

• Angular is a TypeScript-based framework while AngularJS is based on JavaScript.

• Angular has a component-based architecture while AngularJS uses a directive-based archite...read more

Angular uses various techniques for communication between components.

• Input and Output decorators for parent-child communication

• EventEmitter for custom events

• Services for sharing data between unrelated components

• RxJS for reactive programming and obser...read more