10+ Infosys Angular Developer Interview Questions and Answers

Authentication verifies the identity of a user, while authorization determines what a user can access.

• Authentication confirms the user's identity through credentials like username and password.

• Authorization controls the user's access to resources or features based on their authenticated identity.

• Example: Logging into a website (authentication) and then being able to view/edit specific pages based on user roles (authorization).

Software development life cycle (SDLC) is a process used to design, develop, and maintain software.

• SDLC consists of several phases: requirements gathering, design, development, testing, deployment, and maintenance.

• Each phase has specific activities and deliverables.

• SDLC models include Waterfall, Agile, and DevOps.

• Waterfall follows a sequential approach, while Agile and DevOps are iterative and involve continuous feedback and improvement.

• SDLC ensures efficient and quality soft...read more

Attributes in HTML provide additional information about an element and are defined within the element's start tag.

• Attributes are used to modify the behavior or appearance of an HTML element.

• They are specified within the opening tag of an element using name-value pairs.

• Examples include 'href' in an anchor tag (<a href='https://www.example.com'>) and 'src' in an image tag (<img src='image.jpg'>).

Methods to transfer data between components in Angular include Input and Output properties, ViewChild, Services, and Event Emitters.

• Using Input and Output properties to pass data from parent to child components and emit events from child to parent components.

• Using ViewChild to access child components and their properties directly from the parent component.

• Using Services to create a shared service that can be injected into multiple components to share data.

• Using Event Emitters...read more

Agile is a project management methodology that emphasizes flexibility, collaboration, and iterative development.

• Agile focuses on delivering working software in short, iterative cycles called sprints.

• It values customer collaboration, responding to change, and continuous improvement.

• Scrum and Kanban are popular Agile frameworks used in software development.

• Agile promotes self-organizing teams and regular feedback to adapt to changing requirements.

Flexbox is a layout model in CSS that allows for dynamic and responsive design of web pages.

• Flexbox is used to create flexible layouts that can adapt to different screen sizes and orientations.

• It allows for easy alignment and distribution of elements within a container.

• Flexbox properties include display: flex, flex-direction, justify-content, align-items, and flex-grow.

• Example: display: flex; justify-content: center; align-items: center; flex-direction: row;

Angular components structure consists of a component decorator, template, styles, and class.

• Components are the building blocks of Angular applications

• Each component has a decorator that marks it as an Angular component

• Components have a template that defines the view

• Styles can be added to components using CSS

• The class contains the logic for the component

Directives are markers on a DOM element that tell Angular to attach a specified behavior to that DOM element or transform it.

• Directives are used to create reusable components in Angular applications.

• There are three types of directives in Angular: component, structural, and attribute directives.

• Examples of directives include ngIf, ngFor, and ngStyle.

Lazy loading is a technique in web development where resources are loaded only when needed, improving performance.

• Lazy loading helps reduce initial load time by loading resources on demand

• It is commonly used in Angular for loading modules, components, or routes asynchronously

• Lazy loading can improve user experience by only loading necessary resources when required

A directive in Angular is a marker on a DOM element that tells Angular to attach a specific behavior to that element.

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

• They can be classified into three types: Component, Structural, and Attribute directives.

• Examples include ngIf, ngFor, and ngStyle.

setTimeout function in JavaScript is used to execute a function after a specified amount of time.

• setTimeout function takes two parameters: a function to be executed and a time delay in milliseconds

• Example: setTimeout(function(){ console.log('Hello!'); }, 2000); will log 'Hello!' after 2 seconds

• You can also pass additional arguments to the function being executed

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 DatePipe, UpperCasePipe, LowerCasePipe, etc.

• Custom pipes can also be created for specific formatting needs.

• Pipes can be chained together for multiple transformations.

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