Navigators Software Angular Developer Interview Questions and Answers

Improving performance of an application can be achieved through various ways.

• Optimizing code by reducing unnecessary calculations and improving algorithms

• Caching data to reduce database queries and network requests

• Lazy loading modules and components to improve initial load time

• Minifying and compressing files to reduce file size and improve loading speed

• Using server-side rendering to improve initial rendering time

• Implem...read more

Lifecycle hooks are methods that allow you to tap into the lifecycle of Angular components and perform actions at specific stages.

• ngOnInit() - called after the component is initialized

• ngOnChanges() - called when the component's input properties change

• ngDoCheck() - called during every change detection cycle

• ngAfterContentInit() - called after content is projected into the component

• ngAfterContentChecked() - called after e...read more

Dependency Injection is a design pattern used in Angular to inject dependencies into components and services.

• Angular uses a hierarchical injector to provide dependencies

• Dependencies can be injected using constructor injection or property injection

• Services can be provided at the component level or at the module level

• Angular provides a number of built-in services that can be injected

• Custom services can also be created an...read more

There are four types of bindings in Angular.

• Interpolation binding

• Property binding

• Event binding

• Two-way binding

ActivatedRoute is used to access the current route's information.

• It provides access to route parameters, query parameters, and fragment parameters.

• It can be used to subscribe to route parameter changes.

• It can be injected into a component or service.

• Example: accessing a route parameter in a component using snapshot: this.route.snapshot.params['id']

• Example: subscribing to route parameter changes in a component: this.rout...read more

Observables are streams of data that can be observed, while Subjects are both observers and observables.

• Observables are unicast, meaning each subscribed observer receives its own stream of data.

• Subjects are multicast, meaning they can have multiple observers and share the same stream of data.

• Observables are cold, meaning they start emitting data only when subscribed to.

• Subjects are hot, meaning they start emitting data...read more

Change Detection is a mechanism in Angular that tracks changes in the application's data and updates the view accordingly.

• Angular uses Zone.js to detect changes in the application's data.

• Change Detection can be triggered manually or automatically.

• There are two types of Change Detection strategies in Angular: Default and OnPush.

• Default strategy checks for changes in all components and their child components.

• OnPush strat...read more

Data can be shared between components using services, input/output bindings, and state management libraries.

• Create a service to hold the data and inject it into the components that need it

• Use input/output bindings to pass data between parent and child components

• Use state management libraries like NgRx or Redux to manage shared data across components

• Use a shared module to import and export components that need to share ...read more