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

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 comp...read more

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.

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 componen...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.

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

Apply and bind methods are used in Angular to bind data and functions to HTML elements.

• The apply method is used to call a function with a given this value and arguments provided as an array.

• The bind method is used to create a new function with a specified this value and initial arguments.

• Apply and bind methods are commonly used in event handling and data binding in Angular applications.

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...read more