10+ SmartED Innovations Interview Questions and Answers

Data can be shared between components using @Input, @Output, services, and state management libraries.

• Use @Input to pass data from parent to child component

• Use @Output to emit events from child to parent component

• Use services to create a shared data source accessible by multiple components

• Use state management libraries like NgRx or Redux to manage application state

• Use route parameters to pass data between components via URL

Dependency injection is a design pattern used in Angular to provide dependencies to a component or service.

• Dependencies are provided to a component or service through its constructor.

• The Angular injector creates an instance of the dependency and passes it to the component or service.

• Dependencies can be provided at different levels: module, component, or service.

• The @Injectable decorator is used to mark a class as a service that can be injected.

• The @Inject decorator is used to...read more

Angular is a JavaScript framework for building web applications. SPA came in picture for better user experience.

• Angular is a client-side framework developed by Google.

• It allows developers to build dynamic, single-page web applications.

• SPA (Single Page Application) came in picture to provide a better user experience by reducing page reloads and improving performance.

• SPA loads all the necessary resources (HTML, CSS, JS) at once and dynamically updates the content as the user in...read more

Using a shared service or event emitter to facilitate communication between non-relatable components.

• Create a shared service with methods to send and receive data between components

• Use event emitters to emit events and pass data between components

• Utilize RxJS subjects to create an observable data stream for communication

Yes, a variable can be assigned to a function.

• Functions are first-class citizens in JavaScript and can be assigned to variables.

• The variable will then reference the function and can be called as if it were the function itself.

• Example: const myFunction = function() { console.log('Hello World!'); };

• Example: const myVar = myFunction; myVar(); // logs 'Hello World!'

Dependency injection in Angular allows for providing dependencies to a component or service from an external source.

• Dependencies are provided at the module level using providers array in @NgModule decorator.

• Dependencies can also be injected at the component level using constructor parameters.

• Angular's injector resolves dependencies by looking up the provider token in the injector hierarchy.

• Dependency injection helps in creating loosely coupled components and services.

• Example:...read more

Partial reloading in Angular can be achieved by using the Angular Router to reload only specific parts of the page without refreshing the entire page.

• Use Angular Router to navigate to the same component with different parameters to trigger a partial reload

• Use router events like NavigationStart to detect when a route change is happening and perform partial reloading accordingly

• Use Angular's ChangeDetectionStrategy.OnPush to optimize performance by only updating components when...read more

Directives are markers on a DOM element that tell AngularJS to attach a specified behavior to that DOM element.

• Directives are used to create reusable components.

• They can be used to manipulate the DOM.

• They can be used to add behavior to an existing DOM element.

• They can be used to create custom attributes.

• Examples include ng-repeat, ng-show, and ng-hide.

ng-container is a structural directive in Angular used for grouping elements without adding an extra element to the DOM.

• Used to group elements together without adding an extra element to the DOM

• Does not render any extra HTML element

• Helps in organizing code and improving readability

• Useful when applying structural directives like *ngIf or *ngFor

Lazy loading is a technique used to load only the necessary resources for a specific part of a web application when it is needed.

• Lazy loading can be achieved in Angular by using the loadChildren property in the route configuration.

• This property allows you to specify a separate module that will be loaded only when the route is activated.

• Lazy loading helps improve the initial loading time of the application by loading modules on demand rather than all at once.

Decorators are functions that modify classes, methods, or properties at design time.

• Decorators are used in Angular to add metadata to classes, methods, and properties.

• They are denoted by the @ symbol and placed immediately before the item being decorated.

• Examples include @Component, @Injectable, and @Input.

• Decorators can be used to provide additional functionality or configuration to Angular components.

An arrow function is a concise way to write a function in JavaScript.

• Uses the '=>' syntax

• Does not have its own 'this' keyword

• Cannot be used as a constructor

• Can be used as a callback function

RxJS is a library for reactive programming using Observables, allowing for easier handling of asynchronous data streams.

• RxJS stands for Reactive Extensions for JavaScript

• It provides a way to work with asynchronous data streams

• Operators like map, filter, and mergeMap can be used to manipulate and combine streams

• Subscriptions are used to listen for values emitted by Observables

Angular life cycle refers to the series of events that occur from the creation of a component to its destruction.

• Angular components go through various stages like creation, rendering, updating, and destruction.

• Some key life cycle hooks include ngOnInit, ngOnChanges, ngDoCheck, ngOnDestroy, etc.

• Developers can use these hooks to perform tasks like initializing data, reacting to changes, and cleaning up resources.