Infosys Angular Lead Interview Questions and Answers

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 to share data one component to another
Ans. 
Using services or @Input/@Output decorators to share data between components
• Use services to create a shared data service that can be injected into multiple components

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

• Use @Output decorator with EventEmitter to emit events and pass data from child to parent component
Answered by AI
Add your answer
Q2. Http request in angular
Ans. 
Http request in Angular is used to fetch data from a server or API.
• Use HttpClient module to make HTTP requests in Angular

• Subscribe to the Observable returned by the HTTP request to get the data

• Handle errors using catchError operator

• Set headers, query parameters, and request body as needed
Answered by AI
Add your answer

Q1. All Basic questions from HTML
Add your answer
Q2. All basic questions from CSS
Add your answer

Q1. Guards, routing
Add your answer
Q2. Interceptors, observable
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

Q1. Javascript questions
Add your answer