Atrina Technologies Senior Angular Developer Interview Questions and Answers

There are two types of compilations in Angular: Just-in-Time (JIT) compilation and Ahead-of-Time (AOT) compilation.

• Just-in-Time (JIT) compilation: Compiles the Angular application in the browser at runtime. Slower startup time but easier development process.

• Ahead-of-Time (AOT) compilation: Compiles the Angular application during the build process before the browser downloads and runs the code. Faster startup time but r

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 elements in the DOM

• Templates define the UI of the application

• Dependency injecti...read more

Angular is a popular open-source web application framework developed by Google for building dynamic single-page applications.

• Angular is based on TypeScript, a superset of JavaScript.

• It uses components to build the user interface.

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

• It has a powerful CLI for scaffolding and managing projects.

• Angular is commonly used for building interactive web

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

• Dependency injection helps manage components and their dependencies easily

• Modular architecture promotes code reusability and maintainability

• Angular provides a rich ecosystem of tools and libraries for development

• Angular CLI sim

Deep copy creates a new copy of an object with all nested objects also copied, while shallow copy creates a new object with references to the original nested objects.

• Deep copy duplicates all levels of nested objects, while shallow copy only duplicates the top level object.

• Deep copy creates a completely new object with its own memory space, while shallow copy creates a new object that references the same memory location...read more

Denouncing and throttling are techniques used to control the rate at which a function is called.

• Denouncing is the practice of ignoring repeated calls to a function until a certain amount of time has passed.

• Throttling limits the rate at which a function can be called, ensuring it is not called more than once within a specified time interval.

• These techniques are commonly used in front-end development to optimize performa...read more

Dependency Injection is a design pattern in which a class receives its dependencies from external sources rather than creating them itself.

• Allows for easier testing by injecting mock dependencies

• Promotes reusability and modularity by decoupling components

• Reduces code duplication by centralizing dependency creation

• Example: Angular uses Dependency Injection to provide services to components

Routing is the process of navigating between different pages or views in a web application.

• Routing allows users to move between different parts of a web application without reloading the entire page

• It is implemented using a router module in Angular, which maps URLs to components

• Routes can have parameters that can be passed to components for dynamic content

• Routing can be used to create single-page applications (SPAs) wh

Position absolute removes element from normal flow, relative keeps element in flow but can be positioned.

• Position absolute removes element from normal flow, allowing it to be positioned relative to its closest positioned ancestor.

• Position relative keeps element in normal flow but allows it to be positioned relative to its normal position.

• Position absolute elements are not affected by other elements and can overlap, whi...read more

Create a reactive form in Angular to save data in API with validation

• Create a reactive form using FormBuilder in Angular

• Add form controls with proper validation rules using Validators

• Handle form submission and send data to API using HttpClient

• Implement error handling for API requests

• Display success or error messages to the user

Auth-guard is a feature in Angular that controls access to routes based on user authentication status.

• Auth-guards are used to protect routes in Angular applications by checking if a user is authenticated before allowing access.

• They can be implemented using canActivate interface in Angular.

• Auth-guards can redirect unauthenticated users to a login page or display an error message.

• They are commonly used in applications wi...read more

There are multiple ways to communicate in Angular components, including Input, Output, ViewChild, and Services.

• Input - parent component can pass data to child component using @Input decorator

• Output - child component can emit events to parent component using @Output decorator

• ViewChild - parent component can access child component using @ViewChild decorator

• Services - components can communicate through shared services

Use JavaScript to find the longest word in a string.

• Split the string into an array of words using split() method.

• Iterate through the array and compare the length of each word to find the longest one.

• Return the longest word found.

I started my career as a web developer, specializing in frontend technologies like Angular. I have worked on various projects and gained valuable experience.

• Started career as web developer

• Specialized in frontend technologies like Angular

• Worked on various projects

• Gained valuable experience

I have expertise in developing Angular frontend applications with strong knowledge of TypeScript, HTML, CSS, and Angular frameworks.

• Strong knowledge of TypeScript, HTML, and CSS

• Experience in developing Angular frontend applications

• Familiarity with Angular frameworks like AngularJS, Angular 2+, Angular Material

• Understanding of reactive programming and observables in Angular

• Knowledge of state management with tools like N

Time queue in API refers to managing requests in a sequential order.

• Time queue ensures that API requests are processed in the order they are received.

• It helps in preventing overload on the server by limiting the number of concurrent requests.

• Examples include using promises or async/await in JavaScript to handle API calls sequentially.