Bajaj Finserv Angular Frontend Developer Interview Questions and Answers

Angular is a powerful web application framework for building dynamic, single-page applications using TypeScript.

• Component-based architecture: Angular applications are built using reusable components, promoting modularity and maintainability.

• Two-way data binding: Changes in the UI automatically update the model and vice versa, simplifying data management.

• Dependency injection: Angular's built-in dependency injection syst...read more

TypeScript is a superset of JavaScript that adds static typing and other features for better development experience.

• TypeScript is statically typed, while JavaScript is dynamically typed. Example: In TS, you can define a variable as 'let num: number = 5;'.

• TypeScript supports interfaces and enums, which help in defining contracts and enumerations. Example: 'interface User { name: string; age: number; }'.

• TypeScript provid...read more

This code snippet reverses the order of words in a given string using JavaScript and Angular.

• Use the split() method to divide the string into an array of words. Example: 'Hello World'.split(' ') results in ['Hello', 'World'].

• Reverse the array using the reverse() method. Example: ['Hello', 'World'].reverse() results in ['World', 'Hello'].

• Join the reversed array back into a string using the join() method. Example: ['Worl...read more

Arrays in JavaScript have various methods for manipulation; filter and map serve different purposes for transforming data.

• 1. Array methods include: push, pop, shift, unshift, slice, splice, forEach, map, filter, reduce, and more.

• 2. The filter method creates a new array with elements that pass a test (predicate function). Example: [1, 2, 3].filter(x => x > 1) results in [2, 3].

• 3. The map method creates a new array...read more

Pipes in Angular transform data for display in templates, enhancing readability and formatting.

• Pipes are simple functions that accept an input value and return a transformed value.

• Angular provides built-in pipes like DatePipe, CurrencyPipe, and DecimalPipe.

• Custom pipes can be created using the @Pipe decorator for specific transformation needs.

• Example of DatePipe: {{ today | date:'fullDate' }} displays the full date for...read more

Data binding is a technique that connects the UI to the data model, enabling automatic synchronization between them.

• Types of data binding: One-way binding (e.g., displaying data) and two-way binding (e.g., form inputs).

• Example of one-way binding: Using interpolation to display a variable in the template: {{ variableName }}.

• Example of two-way binding: Using ngModel in forms to bind input values to a component property.

• D...read more

Decorators in TypeScript are special annotations that modify classes, methods, properties, or parameters at design time.

• Decorators are functions prefixed with '@'.

• They can be used to add metadata to classes and methods.

• Common types include Class Decorators, Method Decorators, Property Decorators, and Parameter Decorators.

• Example of a Class Decorator: @Component({ selector: 'app-root', templateUrl: './app.component.html...read more

The <b> element is for bold text, while <strong> indicates strong importance, often styled as bold.

• <b> is used for stylistic bolding without implying importance. Example: <b>Bold Text</b>

• <strong> conveys strong importance or emphasis. Example: <strong>Important Text</strong>

• <strong> is semantically meaningful for accessibility tools, while <b> is purely presen...read more

Container projection allows components to project content into designated slots, enhancing flexibility in Angular applications.

• Container projection is achieved using <ng-content> in Angular components.

• It allows a parent component to pass content to a child component dynamically.

• Example: A modal component can use container projection to display different content based on usage.

• Multiple <ng-content> tags can ...read more

Centering a div in SCSS can be achieved using various techniques like flexbox, grid, or margin auto.

• Use Flexbox: Set display: flex; and justify-content: center; align-items: center; on the parent.

• Example: .parent { display: flex; justify-content: center; align-items: center; } .child { width: 50%; }

• Use Grid: Set display: grid; and place the child in the center.

• Example: .parent { display: grid; place-items: center; } .c...read more

Responsive web design ensures optimal viewing across devices by adapting layout and content to different screen sizes.

• Use flexible grid layouts that adjust based on screen size, e.g., CSS Grid or Flexbox.

• Implement media queries to apply different styles for various screen widths, e.g., @media (max-width: 600px) { ... }.

• Utilize responsive images with the 'srcset' attribute to serve different image sizes based on device ...read more

Use JavaScript to find repeating alphabets in an array of strings.

• Loop through each string in the array

• For each string, loop through each character and check if it is repeated

• Store the repeating alphabets in a separate array

Angular lifecycle hooks are methods that allow you to tap into specific points in a component's lifecycle.

• ngOnChanges: Called when an input property changes

• ngOnInit: Called once the component is initialized

• ngDoCheck: Called during every change detection run

• ngAfterContentInit: Called after content (ng-content) has been projected into the component

• ngAfterContentChecked: Called after every check of the projected content

• ng...read more