Infosys Angular Frontend Developer Interview Questions, Process, and Tips

Q1. What is lazy loading and how can we achieve this?
Ans. 
Lazy loading is a technique used to defer loading of non-essential resources until they are actually needed.
• Lazy loading helps improve the initial loading time of a web application by only loading essential resources upfront.

• In Angular, lazy loading is achieved by creating separate modules for different parts of the application and loading them on demand.

• Lazy loading can be implemented using the loadChildren property i...read more
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Q2. Difference between in constructor and NgOninit()?
Ans. 
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: C...read more
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Q3. What is two-way binding?
Ans. 
Two-way binding is a feature in Angular that allows automatic synchronization of data between the model and the view.
• Two-way binding allows changes in the model to be reflected in the view and vice versa

• It simplifies the process of updating the UI based on user input or changes in the data model

• Example: Using ngModel directive in Angular forms to bind input fields to model properties
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Q4. Difference between Observable and Promise
Ans. 
Observable is a stream that allows multiple values over time, while Promise is a single value that resolves or rejects.
• Observable can handle multiple values over time, while Promise can only handle a single value.

• Observable is lazy, meaning it won't execute until it is subscribed to, while Promise is eager and executes immediately.

• Observable is cancellable, allowing you to unsubscribe, while Promise is not cancellable ...read more
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Q5. What is a pipe in angular and its types
Ans. 
A pipe in Angular is used to transform data before displaying it in the template.
• Pipes are used in templates to format data before displaying it to the user

• There are built-in pipes like DatePipe, UpperCasePipe, LowerCasePipe, etc.

• Custom pipes can also be created by implementing the PipeTransform interface

• Pipes can be chained together to perform multiple transformations on the data
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Q1. What is data binding ?
Ans. 
Data binding is the automatic synchronization of data between the model and view components in an application.
• Data binding allows for the seamless updating of data in the model to be reflected in the view and vice versa.

• There are two-way data binding and one-way data binding.

• Two-way data binding updates the model and view simultaneously, while one-way data binding updates in one direction only.

• Example: In Angular, usin...read more
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Q2. Do you know lazy loading?
Ans. 
Lazy loading is a technique used to defer loading of non-essential resources until they are actually needed.
• Lazy loading helps improve performance by only loading resources when they are required.

• In Angular, lazy loading is commonly used for loading modules on demand rather than loading everything upfront.

• Lazy loading can be implemented using Angular's RouterModule and loadChildren feature.
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Q1. Sort array without using merhods
Ans. 
Sort array without using methods
• Iterate through the array and compare each element with the rest to find the correct position

• Swap elements if necessary to sort the array in ascending order

• Repeat the process until the array is fully sorted
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Q2. Reverse string without methods
Ans. 
Reverse a string without using built-in methods
• Create an empty string to store the reversed string

• Iterate through the input string from the last character to the first

• Append each character to the empty string to reverse the input string
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Q3. How to apply ngclass
Ans. 
ngClass is used to conditionally apply CSS classes to an element in Angular.
• Use ngClass directive in the template with an object or array of classes and conditions

• Classes are applied when the condition is true, and removed when false

• Example:
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Q4. Angular Interceptors concept ?
Ans. 
Angular interceptors are a way to intercept HTTP requests and responses to perform operations like logging, modifying requests, or handling errors.
• Interceptors can be used to modify outgoing requests or incoming responses.

• They can be used for tasks like adding headers, logging requests, handling errors, or transforming data.

• Interceptors are implemented as services that implement the HttpInterceptor interface.

• Multiple i...read more
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Q5. Entry point of angular
Ans. 
The entry point of Angular is typically the main.ts file.
• Main.ts file is the first file that is executed when an Angular application is started.

• It bootstraps the AppModule, which is the root module of the application.

• Main.ts file also imports other necessary modules and components required for the application to run.
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In aptitude the interviewer asked for our skills of knowledge and reasoning questions

In this discussion group asking for some practical questions DSA like this

Q1. Why should we hire you
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Q2. Tell me about your previous job
Ans. 
I worked as a frontend developer at a software company, focusing on Angular development.
• Developed responsive web applications using Angular framework

• Collaborated with backend developers to integrate APIs and services

• Implemented new features and fixed bugs based on client requirements

• Participated in code reviews and testing processes

• Attended regular team meetings to discuss project progress
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Q3. Why are you changing your current job
Ans. 
Seeking new challenges and growth opportunities in a more innovative environment.
• Looking for new challenges and opportunities for growth

• Interested in working in a more innovative environment

• Seeking a better work-life balance
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Q4. Tell me about previous organization
Ans. 
I worked at a software development company specializing in e-commerce solutions.
• Developed frontend applications using Angular framework

• Collaborated with backend developers to integrate APIs

• Participated in code reviews and testing processes
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Q5. Tell me about your challenging task did you face
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