Infosys Angular Lead Interview Questions and Answers

Q1. Angular routing
Add your answer
Q2. What are pipes in angular
Ans. 
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
Answered by AI
Add your answer

Q1. Which version of java you use?
Ans. 
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.
Answered by AI
Add your answer
Q2. What are the new features in java 8?
Ans. 
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
Answered by AI
Add your answer

Q1. MCQ questioons were there based on angular framework
Add your answer
Q2. Services mcq were there
Add your answer

Q1. What is Dependecy Injection
Ans. 
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
Answered by AI
Add your answer
Q2. What is routing
Ans. 
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
Answered by AI
Add your answer

Q1. How to pass data from component to another component
Add your answer
Q2. Life cycle hooks
Add your answer
Q3. Observables&subject
Add your answer

Q1. Angular Lifecycle
Add your answer
Q2. Types of compilations in Angular
Ans. 
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
Answered by AI
Add your answer
Q3. Building blocks of Angular
Ans. 
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
Answered by AI
Add your answer

Q1. Create a reactive form and save data in API with proper validation?
Ans. 
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
Answered by AI
Add your answer
Q2. What is Auth-gaurd?
Ans. 
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
Answered by AI
Add your answer
Q3. How many ways we can communicate in Angular component?
Ans. 
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
Answered by AI
Add your answer
Q4. Find longest word from string in JS?
Ans. 
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.
Answered by AI
Add your answer

Q1. Your Career Journey?
Ans. 
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
Answered by AI
Add your answer
Q2. Your experties?
Ans. 
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
Answered by AI
Add your answer

Q1. How directives are different from component
Ans. 
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 ng...read more
Answered by AI
Add your answer
Q2. What is hoisting
Ans. 
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during compilation.
• Variable and function declarations are hoisted to the top of their scope, regardless of where they are declared in the code.

• Only the declarations are hoisted, not the initializations.

• Function declarations are hoisted before variable declarations.
Answered by AI
Add your answer

Q1. Explain design patterns.
Ans. 
Design patterns are reusable solutions to common problems in software design.
• Design patterns help in creating maintainable, scalable, and efficient code.

• They provide a common language for developers to communicate about solutions to recurring problems.

• Examples of design patterns include Singleton, Factory, Observer, and Strategy patterns.
Answered by AI
Add your answer
Q2. Explain subject. what is replay subject
Ans. 
ReplaySubject is a type of Subject in RxJS that records multiple values and replays them to new subscribers.
• ReplaySubject is a type of Subject in RxJS

• It records multiple values and replays them to new subscribers

• It has a buffer size that determines how many values to replay
Answered by AI
Add your answer

Q1. Salary discussion
Add your answer

Q1. What are the time queue, etc in API
Ans. 
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.
Answered by AI
Add your answer
Q2. What is the meaning of preflight in API? (All questions are related to dev oops profile. I applied for Angular)
Add your answer

NAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA