Capgemini Angular Developer Interview Questions and Answers

Multi cast in Angular allows multiple subscribers to receive the same data from a single source.

• Used to broadcast data to multiple subscribers

• Helps in reducing duplicate API calls

• Can be implemented using Subjects in RxJS

Event emitter is used in Angular to facilitate communication between components by emitting events.

• Event emitter is a class in Angular that allows components to emit custom events.

• It is used to facilitate communication between parent and child components.

• Parent components can subscribe to these events and react accordingly.

• Example: Child component emitting an event to notify the parent component about a change.

Use RxJS to handle multiple API calls efficiently in Angular.

• Use RxJS operators like forkJoin, combineLatest, or mergeMap to handle multiple API calls concurrently or sequentially.

• Consider using catchError operator to handle errors and retry operator to retry failed API calls.

• Use switchMap operator to cancel previous API calls when making new ones to avoid memory leaks.

• Utilize subjects or BehaviorSubjects to share data...read more

Child route is used for nested routes within a parent route, while forRoot is used for configuring routes at the root level of the application.

• Child routes are defined within the parent route's configuration, allowing for nested routing structures.

• forRoot is used in the AppRoutingModule to configure routes at the root level of the application.

• Child routes are typically used for organizing and managing related component...read more

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

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.

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...read more

A custom pipe in Angular is a feature that allows you to transform data in templates.

• Custom pipes are created by implementing the PipeTransform interface in a class.

• The class must have a transform method that takes input data and optional parameters.

• Custom pipes are then declared in the module's declarations array and can be used in templates.

• Example: Creating a custom pipe to format dates in a specific way.

Angular application bootstraps by loading the root module and then creating the component tree.

• Angular application bootstraps by loading the root module, which is defined in the 'AppModule' class.

• The 'AppModule' class contains metadata such as the list of components, directives, and services used in the application.

• After loading the root module, Angular creates the component tree by instantiating the root component spe...read more