Top 200 Angular Interview Questions and Answers

Routing in Angular is the process of navigating between different components based on the URL.

• Routing allows users to navigate between different parts of an Angular application without reloading the entire page.

• Routes are defined in the app-routing.module.ts file using the RouterModule and Routes classes.

• Each route maps a URL path to a component, which is then displayed when the corresponding URL is accessed.

• Angular uses the router-outlet directive to render the component ass...read more

Angular Architecture is a structural design of Angular applications that includes components, modules, services, and routing.

• Angular applications are built using components, which are reusable building blocks with their own logic and templates.

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

• Services are used for sharing data and functionality across components.

• Routing allows navigation between different components based on the URL.

• Angular follows a...read more

Life cycle hooks are methods that allow you to tap into the lifecycle of a component in Angular.

• Life cycle hooks are predefined methods that get called at specific stages of a component's life cycle.

• They provide a way to perform actions before, during, or after certain events in a component's life cycle.

• Some commonly used life cycle hooks in Angular are ngOnInit, ngOnChanges, ngAfterViewInit, ngOnDestroy, etc.

• ngOnInit is called after the component has been initialized and its...read more

Angular lifecycle hooks are methods that allow you to tap into specific points in a component's lifecycle.

• ngOnChanges: Called when an input property changes

• ngOnInit: Called once the component is initialized

• ngDoCheck: Called during every change detection run

• ngAfterContentInit: Called after content (ng-content) has been projected into the component

• ngAfterContentChecked: Called after every check of the projected content

• ngAfterViewInit: Called after the component's view has been ...read more

ng-content is used in Angular to project content into a component's template.

• ng-content is used to pass content into a component from the outside.

• It allows for dynamic content insertion within a component's template.

• ng-content is often used in combination with ng-template and ng-container.

• It is commonly used for creating reusable components with varying content.

Both Java and Angular have recently released new versions with significant updates and improvements.

• Java 16 was released in March 2021 with new features like Records, Pattern Matching, and Vector API.

• Angular 12 was released in May 2021 with improvements in performance, accessibility, and developer experience.

• Java and Angular are both widely used technologies in the software development industry.

• It's important for technical recruiters to stay up-to-date with the latest technol...read more

Angular is a front-end framework while Node.js is a back-end runtime environment.

• Angular is used for building dynamic web applications with a focus on the client-side.

• Node.js is used for building server-side applications with JavaScript.

• Angular uses TypeScript for building applications while Node.js uses JavaScript.

• Angular has a large community and a lot of pre-built components while Node.js has a vast library of modules.

• Angular can be used with Node.js to build full-stack ap...read more

Secure access to page in Angular can be implemented using route guards.

• Route guards can be used to restrict access to certain pages based on user authentication and authorization.

• AuthGuard can be used to check if the user is authenticated before allowing access to a page.

• RoleGuard can be used to check if the user has the necessary role to access a page.

• CanActivateChild can be used to restrict access to child routes.

• CanDeactivate can be used to prevent navigation away from a p...read more

React js is a lightweight library for building user interfaces, while Angular is a full-fledged framework with more features and complexity.

• React is more flexible and allows for easier integration with other libraries and frameworks.

• Angular provides more out-of-the-box features like routing, forms handling, and dependency injection.

• React is easier to learn and has a larger community support.

• Angular has a steeper learning curve but offers more structure and consistency in larg...read more

Route guards are used to control access to routes in Angular applications.

• Route guards are used to protect routes from unauthorized access.

• They can be used to check if a user is authenticated or has certain permissions before allowing access to a route.

• There are three types of route guards in Angular: CanActivate, CanActivateChild, and CanLoad.

• CanActivate is used to determine if a route can be activated.

• CanActivateChild is used to determine if a child route can be activated.

• C...read more

I deploy Angular applications using the Angular CLI and various hosting services.

• Use Angular CLI to build the application

• Choose a hosting service like Firebase, Netlify, or AWS for deployment

• Configure deployment settings in the hosting service

• Deploy the application using the hosting service's tools

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 loaded modules are loaded only when the user navigates to the respective route.

• It can be implemented by creating a separate module for each feature and loading it lazily.

Services in Angular are singleton objects that provide functionality to components. Observables are used for asynchronous data streams.

• Services are used to share data and functionality across components

• Services are singleton objects that can be injected into components

• Observables are used for asynchronous data streams

• Observables can be subscribed to in order to receive data

• Observables can emit multiple values over time

NgViewInit() is a lifecycle hook method in Angular that is called after the component's view has been fully initialized.

• NgViewInit() is used to perform tasks that require the view to be fully initialized, such as initializing data-bound properties or setting up event listeners.

• It is commonly used to fetch data from a backend API and update the view accordingly.

• Example: ngOnInit() { this.http.get('api/data').subscribe(data => { this.data = data; }); }

Yes, I am proficient in React and have experience working with Angular as well.

• Proficient in React for building user interfaces

• Experience working with Angular for front-end development

• Familiar with component-based architecture in both React and Angular

Angular is a popular front-end framework for building dynamic web applications, while JavaScript is a programming language commonly used for web development.

• Angular is a front-end framework developed by Google for building single-page applications

• JavaScript is a programming language used for adding interactivity to web pages

• Angular uses TypeScript, a superset of JavaScript, for development

• JavaScript is widely used for client-side scripting and server-side development with Nod...read more

Possible ways to pass data between different components in Angular include Input bindings, Output bindings, Services, and Event Emitters.

• Using Input bindings to pass data from parent to child components

• Using Output bindings to pass data from child to parent components

• Using Services to share data between components

• Using Event Emitters to emit events and pass data between components

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

• AngularJS is an older version of Angular

• Angular uses TypeScript while AngularJS uses JavaScript

• Angular has a more component-based architecture

• Angular has better performance and improved features compared to AngularJS

Pure pipes do not have any side effects and always return the same output for the same input, while impure pipes can have side effects and may not return the same output for the same input.

• Pure pipes are stateless and deterministic.

• Impure pipes can have side effects like modifying global variables or making network requests.

• Pure pipes always return the same output for the same input.

• Impure pipes may not return the same output for the same input.

• Examples of pure pipes include ...read more

A pipe is a feature in Angular that allows you to transform data in templates. There are built-in pipes and you can also create custom pipes.

• Types of pipes include built-in pipes like DatePipe, UpperCasePipe, LowerCasePipe, etc.

• Custom pipes can be created by using the @Pipe decorator and implementing the PipeTransform interface.

• To write a custom pipe, first create a new TypeScript file for the pipe, define the pipe class with @Pipe decorator, implement PipeTransform interface...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, correct it to the appropriate attribute or directive

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.

• Components can have inputs and outputs to communicate with other components.

• Examples of components in Angular include buttons, forms, and navigation bars.

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

Angular life cycle refers to the sequence of events that occur from the creation of a component to its destruction.

• Initialization - component is created, properties are initialized

• Change Detection - Angular checks for changes in component properties and updates the view

• Content Projection - content is projected into component's view

• Content Checked - Angular checks projected content for changes

• Destroy - component is destroyed and resources are cleaned up

Data can be passed in Angular from component to component using input properties, output properties, services, and state management libraries like NgRx.

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

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

• Use services to share data between components

• Use state management libraries like NgRx for complex data sharing scenarios

Angular routing is handled using RouterModule which provides a way to navigate between different components.

• Use RouterModule.forRoot() method in app.module.ts to set up the main routes

• Use RouterModule.forChild() method in feature modules to define routes specific to that module

• Define routes using Route interface with path and component properties

• Use routerLink directive in HTML templates to navigate to different routes

• Use ActivatedRoute service to access route parameters and ...read more

Both Java and Angular programming are required for the Senior Project Manager role.

• Java is used for backend development and Angular for frontend development.

• Knowledge of both languages is necessary for effective project management.

• Examples of tasks include designing and implementing software solutions using Java and Angular.

• Experience with frameworks such as Spring and Hibernate is also beneficial.

Angular project starts with creating a new project using Angular CLI.

• Install Angular CLI globally using npm

• Create a new project using ng new command

• Serve the project using ng serve command

• Open the project in a browser at http://localhost:4200/

Decorators are used in Angular to modify classes, methods, and properties at compile-time.

• Component: marks a class as an Angular component and provides metadata about the component

• Directive: marks a class as an Angular directive and provides metadata about the directive

• Pipe: marks a class as an Angular pipe and provides metadata about the pipe

• Injectable: marks a class as an Angular service and provides metadata about the service

• NgModule: marks a class as an Angular module and...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() is an Angular lifecycle hook that is called after Angular has initialized the component.

• Constructor is called before NgOnInit() during component initialization.

• Example: Constructor is used to inject services, NgOnInit() is used ...read more

Angular offers a more comprehensive solution with built-in features like routing, forms, and HTTP client, while React is more lightweight and flexible.

• Angular provides a more opinionated and comprehensive framework with built-in features like routing, forms, and HTTP client

• React is more lightweight and flexible, allowing developers to choose their own libraries for additional functionality

• Angular has a steeper learning curve due to its complexity and the need to learn its spe...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 single-page applications

• Angular uses components, services, and directives for building applications

• Angular has features like dependency injection, routing, and forms

Angular has several lifecycle methods including ngOnInit, ngOnDestroy, ngDoCheck, etc.

• ngOnInit - called after the component is initialized

• ngOnChanges - called when the input properties of a component change

• ngDoCheck - called during every change detection run

• ngAfterContentInit - called after content is projected into the component

• ngAfterContentChecked - called after the projected content has been checked

• ngAfterViewInit - called after the component's view has been initialized

• ng...read more

Pipes are used to transform data in templates, while directives are used to manipulate the DOM.

• Pipes are used to format data in templates, such as date formatting or currency conversion.

• Directives are used to add behavior to DOM elements, like hiding or showing elements based on conditions.

• Example: Using a pipe to format a date in a template: {{ currentDate | date }}

• Example: Using a directive to show/hide an element based on a condition:

Angular Pipes are used to transform data in Angular templates.

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

• They can be used to transform strings, numbers, dates, and other types of data.

• Common built-in pipes include DatePipe, UpperCasePipe, LowerCasePipe, and CurrencyPipe.

• Custom pipes can also be created to suit specific formatting needs.

Angular pipe is a feature in Angular that allows you to transform data in templates.

• Angular 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 of Angular pipes include DatePipe, UpperCasePipe, and CurrencyPipe.

Components are building blocks of Angular applications. Data can be shared between components using input/output properties, services, or state management. Pipes are used for data transformation in templates.

• Components are reusable, self-contained units of code that define the view and behavior of a part of the application.

• Data can be shared between components using @Input and @Output properties for parent-child communication, services for cross-component communication, or st...read more

Services in Angular are singleton objects that provide functionality to components. They can be called using dependency injection.

• Services are used to share data and functionality across multiple components

• They can be created using the 'ng generate service' command

• Services can be injected into components using the constructor

• To call a service API, use Angular's HttpClient module

• Data can be bound to components using property binding or two-way binding

Hooks are functions that allow you to execute code at specific points in a component's life cycle.

• ngOnInit() - called after the component is initialized

• ngOnChanges() - called when the component's input properties change

• ngDoCheck() - called during every change detection cycle

• ngAfterContentInit() - called after content is projected into the component

• ngAfterContentChecked() - called after every check of projected content

• ngAfterViewInit() - called after the component's view has b...read more

Structural directives in Angular are used to modify the DOM layout by adding, removing, or manipulating elements based on conditions.

• Structural directives are preceded by an asterisk (*) in Angular templates.

• Common structural directives include *ngIf, *ngFor, and *ngSwitch.

• They allow developers to conditionally render or remove elements from the DOM.

• Example:

  Content

To upgrade an Angular project to a higher version, follow these steps:

• Check the compatibility of the current project with the target version

• Update the Angular CLI to the latest version

• Update the dependencies in package.json

• Update the Angular framework and related packages

• Resolve any breaking changes and errors

• Test the upgraded project thoroughly

Angular 8 introduces new features and improvements for better performance and developer experience.

• Ivy renderer for faster compilation and smaller bundle sizes

• Improved web worker support for better performance

• Lazy loading of components and routes

• Support for TypeScript 3.4 and 3.5

• New features in Angular Material and CDK

• Differential loading for faster startup times

• Improved accessibility features

Pipe is a feature in Angular that allows you to transform data in templates. Pure pipes are called only when a pure change to the input is detected, while impure pipes are called every time change detection runs.

• Pipe is a feature in Angular used to transform data in templates

• Pure pipes are called only when a pure change to the input is detected

• Impure pipes are called every time change detection runs

React is a JavaScript library for building user interfaces, while Angular is a full-fledged framework for building web applications.

• React is a library, while Angular is a framework.

• React uses a virtual DOM for better performance, while Angular uses a regular DOM.

• React is more lightweight and flexible, while Angular has more built-in features and conventions.

• React is mainly focused on the view layer, while Angular provides a full MVC framework.

Closures in JS allow functions to access variables from their outer scope. Angular uses services for state management.

• Closures in JavaScript allow functions to access variables from their outer scope, even after the outer function has finished executing.

• Angular uses services to manage state in applications, allowing for centralized data management and communication between components.

• State management in Angular involves storing and updating application state in a predictable ...read more

Injecting services in constructor ensures they are available throughout the component's lifecycle, while injecting in ngOnInit allows for initialization after component creation.

• Injecting services in constructor ensures they are available for use throughout the component's lifecycle.

• Injecting services in ngOnInit allows for initialization after component creation, ensuring they are ready for use.

• Injecting services in ngOnInit can also help in lazy loading services only when n...read more

Angular is the newer version of AngularJS with improved features and performance.

• Angular is a complete rewrite of AngularJS.

• Angular uses TypeScript while AngularJS uses JavaScript.

• Angular has a more component-based architecture.

• Angular has better performance and improved dependency injection compared to AngularJS.

• Angular has a more streamlined and simplified syntax compared to AngularJS.

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 formatting needs.

• Pipes can be chained together for multiple transformations.

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

To set up an Angular project from scratch, follow these steps:

• Install Node.js and npm

• Install Angular CLI using npm

• Create a new project using ng new command

• Serve the project using ng serve command

• Start coding your Angular app

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 the HTML template.

• They can be used to add, remove or modify attributes of an element.

• Examples include ngClass, ngStyle, and ngModel.

Lifecycle hooks in Angular are methods that allow you to tap into the lifecycle of a component or directive.

• Lifecycle hooks include ngOnInit, ngOnChanges, ngDoCheck, ngOnDestroy, etc.

• ngOnInit is used for initialization logic, ngOnChanges for reacting to input changes, ngDoCheck for custom change detection, ngOnDestroy for cleanup tasks, etc.

angular.json is a configuration file used by Angular CLI to manage project settings.

• Contains project configuration settings such as build options, asset paths, and environment variables.

• Can be modified manually or through the Angular CLI.

• Located in the root directory of an Angular project.

• Example: "assets": ["src/favicon.ico", "src/assets"] specifies the asset paths for the project.

I have used Angular 2, 4, 5, 6, 7, 8, 9, and 10.

• I have experience in developing web applications using Angular 2 and above.

• I have worked on Angular projects with various versions including 4, 5, 6, 7, 8, 9, and 10.

• I am familiar with the latest features and updates in Angular 10.

• I have used Angular CLI for creating and managing Angular projects.

• I have experience in implementing Angular Material design components.

• I have worked on projects that involve integrating Angular with b...read more

Pure pipes are stateless and do not change the input data, while impure pipes can have side effects and change the input data.

• Pure pipes are faster as they only run when a pure change to the input data is detected.

• Impure pipes can have side effects like making HTTP requests or modifying the input data directly.

• Pure pipes are marked with the @Pipe decorator with pure set to true, while impure pipes have pure set to false or omitted.

• Example: CurrencyPipe is a pure pipe as it do...read more

React is more flexible, has a simpler learning curve, better performance, and a larger community support compared to Angular.

• React is more flexible and allows for greater control over the application structure.

• React has a simpler learning curve compared to Angular, making it easier for new developers to pick up.

• React has better performance due to its virtual DOM implementation, resulting in faster rendering.

• React has a larger community support and a vast ecosystem of librarie...read more

Child life cycle hooks are methods that are called at specific points in the lifecycle of a child component in Angular.

• ngOnChanges: called when an input property of the component changes

• ngOnInit: called once the component is initialized

• ngDoCheck: called during every change detection run

• ngAfterContentInit: called after content (ng-content) has been projected into the component

• ngAfterContentChecked: called after every check of the projected content

• ngAfterViewInit: called after ...read more

AngularJS is the first version of Angular, while Angular refers to versions 2 and above.

• AngularJS is based on JavaScript, while Angular is based on TypeScript.

• AngularJS uses controllers and $scope for data binding, while Angular uses components and directives.

• Angular has better performance and improved features compared to AngularJS.

• Angular has a more modular and component-based architecture.

Inheritance in Angular components allows child components to inherit properties and methods from parent components.

• Child components can access parent component properties and methods using the 'super' keyword.

• Parent component properties and methods can be overridden in child components.

• Inheritance can be achieved using the 'extends' keyword in the child component class definition.

• Inheritance can also be achieved using mixins, which allow multiple inheritance in Angular.

Performance tuning in Angular involves optimizing code, reducing load times, and improving user experience.

• Use lazy loading to load modules only when needed

• Minimize the number of HTTP requests by combining files and using caching

• Optimize change detection by using OnPush strategy

• Avoid unnecessary DOM manipulations and use trackBy function in ngFor loops

• Use AOT compilation to reduce bundle size and improve load times

Global error handling in Angular can be done using ErrorHandler class.

• Create a class that implements the ErrorHandler interface

• Override the handleError() method to handle errors globally

• Provide the ErrorHandler class in the providers array of AppModule

• Use the error handling service to log errors or display error messages

I am currently using Angular 10 in my projects.

• Using Angular 10 for its improved performance and features

• Familiar with Angular 9 and previous versions as well

• Experience in upgrading projects from older Angular versions to Angular 10

Pure pipe and impure pipe are concepts in Angular framework for data transformation.

• Pure pipe is a pipe that is stateless and doesn't modify the input data.

• Impure pipe is a pipe that can have side effects and modify the input data.

• Pure pipes are more efficient as they are only executed when the input data changes.

• Impure pipes are executed on every change detection cycle, even if the input data remains the same.

• Pure pipes are denoted by the 'pure' keyword in Angular.

• Impure pip...read more

React and Angular are popular JavaScript frameworks used for building dynamic web applications.

• React is a JavaScript library developed by Facebook for building user interfaces.

• React uses a virtual DOM for better performance and allows for component-based architecture.

• Angular is a TypeScript-based open-source web application framework developed by Google.

• Angular provides a full-fledged MVC framework and two-way data binding.

• Both React and Angular are widely used in the industr...read more

Data can be passed between Child and Parent components in Angular using @Input and @Output decorators.

• Use @Input decorator in the child component to receive data from the parent component.

• Use @Output decorator along with EventEmitter in the child component to send data to the parent component.

• Parent component can pass data to child component using property binding.

• Child component can emit events using EventEmitter to send data to parent component.

Setting up environment in Angular app, understanding pipes, async, pure/impure, Subject and BehaviorSubject in theory

• Setting up environment in Angular app involves configuring environment files for different environments like development, production, etc.

• Pipes in Angular are used for transforming data in templates. Async pipes are used for handling asynchronous data streams.

• Pure pipes are stateless and only recompute when the input values change, while impure pipes can be cal...read more

ngIf is a structural directive in Angular that conditionally adds or removes elements from the DOM.

• ngIf evaluates a boolean expression and renders the element if the expression is true.

• It can be used with else, then, and ng-template to handle different scenarios.

• Conditional statements in Angular are used to execute a block of code based on a condition.

• They can be used with ngIf, ngSwitch, and ternary operators.

Forms in Angular are used to handle user input and validation.

• Template-driven forms: Uses directives like ngModel to build forms in the template.

• Reactive forms: Uses form control objects to build forms programmatically in the component.

• Form validation: Angular provides built-in validators like required, minLength, and custom validators.

• Form submission: Forms can be submitted using ngSubmit event or formControl methods.

• Handling form data: Data can be accessed and manipulated u...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 decorators @Input and @Output respectively.

• Example:

Angular offers a more comprehensive framework with built-in features, while React is more lightweight and flexible.

• Angular provides a full-fledged framework with features like routing, forms, and HTTP client out of the box.

• React is more of a library focused on building UI components, allowing for more flexibility and customization.

• Angular has a steeper learning curve due to its complexity, but can be beneficial for large-scale applications with complex requirements.

• React is e...read more

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

• ngOnChanges: Called when an input property changes

• ngOnInit: Called once the component is initialized

• ngDoCheck: Called during every change detection run

• ngAfterContentInit: Called after content is projected into the component

• ngAfterContentChecked: Called after every check of projected content

• ngAfterViewInit: Called after the component's view has been initializ...read more

Improving performance in Angular app involves optimizing code, reducing HTTP requests, lazy loading modules, and using AOT compilation.

• Optimize code by avoiding unnecessary watchers and using track by in ngFor loops

• Reduce HTTP requests by combining multiple requests into one using HTTP interceptors

• Lazy load modules to only load components when needed, improving initial load time

• Use Ahead-of-Time (AOT) compilation to pre-compile templates and improve load time

Directives in Angular are markers on a DOM element that tell Angular to attach a specified behavior to that DOM element or transform the DOM element and its children.

• Directives are used to extend HTML with new attributes or elements.

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

• Examples of built-in directives in Angular include ngIf, ngFor, and ngStyle.

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

• Angular is developed and maintained by Google.

• It uses TypeScript for coding.

• Angular follows the MVC (Model-View-Controller) architecture.

• Directives, components, services, and modules are key building blocks in Angular.

• Example: Creating a new component in Angular - ng generate component my-component

React is a JavaScript library for building user interfaces.

• React is a JavaScript library developed by Facebook.

• React uses a virtual DOM for better performance.

• React is component-based, making it easier to reuse code.

• React is mainly used for building single-page applications.

• Angular is a full-fledged framework for building web applications.

• Angular uses two-way data binding, while React uses one-way data flow.

• Angular has a steeper learning curve compared to React.

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

• Angular is developed and maintained by Google.

• It uses TypeScript for building scalable and maintainable applications.

• Angular has a powerful CLI for generating components, services, and more.

• It has a large and active community with many third-party libraries and plugins available.

• Angular has a modular architecture that allows for easy code reuse and testing.

Angular file structure organizes code into modules, components, services, and assets.

• Angular projects have a src folder containing app and assets folders

• App folder contains modules, components, services, and other files

• Components have their own folder with HTML, CSS, and TypeScript files

• Services are placed in a separate folder for reusability

• Assets folder stores static files like images and fonts

A service in Angular is a class that encapsulates a specific functionality and can be shared across components.

• Services are used to share data or functionality across multiple components in an Angular application

• Services are typically singleton instances, meaning there is only one instance of a service in the application

• Services can be injected into components, directives, or other services using Angular's dependency injection system

Angular is a full-fledged framework with more features and conventions, while React is a library focused on UI components.

• Angular is a full-fledged framework with built-in features like routing, forms, and HTTP client, while React is a library focused on building UI components.

• Angular uses two-way data binding, where changes in the model automatically reflect in the view and vice versa, while React uses one-way data flow, making data changes more predictable.

• Angular uses Type...read more

Performance improvements in Angular can be achieved through lazy loading, AOT compilation, and optimizing change detection.

• Lazy loading: load modules only when needed

• AOT compilation: pre-compile templates for faster rendering

• Optimizing change detection: use OnPush strategy, avoid unnecessary bindings

• Use trackBy function for ngFor loops

• Use pure pipes instead of impure pipes

• Use ngZone.runOutsideAngular() for heavy computations

• Use Web Workers for parallel processing

• Minimize HTTP...read more

Angular Life Cycle Hooks are methods that allow you to tap into the lifecycle of a component or directive.

• ngOnChanges - called when an input property changes

• ngOnInit - called once the component is initialized

• ngDoCheck - called during every change detection run

• ngAfterContentInit - called after content (ng-content) has been projected into the component

• ngAfterContentChecked - called after every check of the projected content

• ngAfterViewInit - called after the component's view has...read more

Angular releases new versions regularly with updates and improvements.

• Angular follows a semantic versioning scheme with major, minor, and patch updates.

• Major updates introduce breaking changes and new features.

• Minor updates add new features and improvements.

• Patch updates include bug fixes and minor enhancements.

• For example, Angular 10 introduced stricter types, improved performance, and updated dependencies.

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 updating the necessary components, while Angular's two-way data binding can cause performance issues.

• React has a larger and more active community, providing better support and a wider range of resources compared to Angular.

Tasks related to forms in Angular and React

• Angular: Create a form using FormBuilder, add validation, submit data to server

• React: Create a form using controlled components, add validation, handle form submission

Angular life cycle consists of several phases that a component goes through from creation to destruction.

• Angular components go through several life cycle hooks such as ngOnInit, ngOnChanges, ngOnDestroy, etc.

• ngOnInit is used for initialization logic, ngOnChanges is used for detecting changes in input properties, ngOnDestroy is used for cleanup tasks.

• Life cycle hooks allow developers to tap into key moments in a component's life cycle.

Directives are used to add behavior to existing DOM elements, while components are used to create new custom elements.

• Directives are used to manipulate the behavior of existing DOM elements, such as changing their appearance or adding event listeners.

• Components are used to create custom elements with their own templates, styles, and behavior.

• Directives can be structural (like ngIf and ngFor) or attribute-based (like ngStyle and ngClass).

• Components are always associated with a...read more

React is a JavaScript library for building user interfaces, while Angular is a full-fledged framework for web development.

• React is a library, while Angular is a framework.

• React uses a virtual DOM for better performance, while Angular uses a regular DOM.

• React is more flexible and allows developers to choose their own tools and libraries, while Angular has a more opinionated structure.

• React is mainly focused on the view layer, while Angular provides a more comprehensive solutio...read more

Angular lifecycle includes various stages like ngOnChanges, ngOnInit, ngDoCheck, etc.

• Angular components go through a series of lifecycle stages from creation to destruction.

• ngOnChanges is called when an input property changes.

• ngOnInit is called after the first ngOnChanges.

• ngDoCheck is called during every change detection run.

• ngAfterContentInit is called after content is projected into the component.

• ngAfterViewInit is called after the component's view has been initialized.

• ngOn...read more

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

• Angular is a TypeScript-based open-source front-end web application framework.

• It allows developers to build single-page applications with dynamic content.

• Angular provides features like data binding, dependency injection, and routing.

• Examples of popular Angular applications include Gmail and Netflix.

Angular lifecycle hooks are methods that allow you to tap into the lifecycle of a component or directive.

• ngOnChanges: Called when an input property changes

• ngOnInit: Called once the component is initialized

• ngDoCheck: Called during every change detection run

• ngAfterContentInit: Called after content (ng-content) has been projected into the component

• ngAfterContentChecked: Called after every check of the projected content

• ngAfterViewInit: Called after the component's view has been i...read more

React is a JavaScript library for building user interfaces, while Angular is a full-fledged framework for web development.

• React is a library, while Angular is a framework

• React uses a virtual DOM, while Angular uses a real DOM

• React is more lightweight and flexible, while Angular has more built-in features and tools

• React uses JSX for templating, while Angular uses HTML templates

• React is maintained by Facebook, while Angular is maintained by Google

Angular offers advantages such as two-way data binding, dependency injection, and modular architecture.

• Two-way data binding allows automatic synchronization of data between the model and the view, reducing the need for manual DOM manipulation.

• Dependency injection helps manage components and their dependencies, making code more modular, reusable, and testable.

• Modular architecture allows for easier maintenance, scalability, and collaboration among developers.

• Angular provides a ...read more

Angular applications are built using the Angular CLI, which provides a command-line interface for creating, building, and serving Angular projects.

• Angular applications are built using the Angular CLI (Command Line Interface)

• The Angular CLI provides commands for creating new projects, generating components, services, modules, etc.

• To build an Angular application, you can use the 'ng build' command which compiles the application into an output directory

Components in Angular are reusable building blocks that encapsulate HTML, CSS, and TypeScript code.

• Components are the basic building blocks of an Angular application

• Each component consists of a TypeScript class, an HTML template, and a CSS file

• Components help in organizing the application into smaller, reusable pieces

• Components can communicate with each other using @Input and @Output decorators

• Example: AppComponent is the root component in an Angular application

Angular is a full-fledged framework for building web applications, while React is a JavaScript library for building user interfaces.

• Angular is a complete framework with built-in features like routing, forms, and HTTP client, while React is a library focused on building UI components.

• Angular uses two-way data binding, while React uses one-way data flow.

• Angular uses TypeScript as its primary language, while React uses JavaScript (ES6+).

• Angular has a steep learning curve due to ...read more

Lifecycle hooks in Angular are methods that allow you to tap into the lifecycle of a component, directive, or service.

• ngOnChanges: Called when an input property changes

• ngOnInit: Called once the component is initialized

• ngDoCheck: Called during every change detection run

• ngAfterContentInit: Called after content (ng-content) has been projected into the component

• ngAfterContentChecked: Called after every check of the projected content

• ngAfterViewInit: Called after the component's vi...read more

Multicasting in Angular refers to the ability to broadcast a single value to multiple subscribers.

• Allows a single source to emit data to multiple subscribers

• Uses Subjects or BehaviorSubjects to achieve multicasting

• Helps in scenarios where multiple components need to react to the same data changes

Angular 15 is not released yet. The latest version is Angular 12.

• Angular 15 has not been released yet.

• The latest stable version of Angular is Angular 12.

• Angular team regularly releases updates and new features.