Cognizant Angular Developer Interview Questions and Answers

Components can communicate using @Input and @Output decorators, services, and event emitters.

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

• Use @Output decorator and EventEmitter to emit events from child to parent component

• Use services to share data between components

Implementing a login page involves creating a form for users to input their credentials and validating them against a database.

• Create a login form with fields for username and password

• Use Angular's form validation to ensure required fields are filled out

• Send the user's credentials to a backend server for authentication

• Upon successful authentication, redirect the user to the main application page

This C code demonstrates a simple program that prints 'Hello, World!' to the console.

• Include the standard input-output header: #include <stdio.h>

• Define the main function: int main() { ... }

• Use printf to output text: printf('Hello, World!\n');

• Return 0 to indicate successful execution: return 0;

Using services or @Input/@Output decorators to share data between components

• Use services to create a shared data service that can be injected into multiple components

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

• Use @Output decorator with EventEmitter to emit events and pass data from child to parent component

Promises are used for asynchronous operations that return a single value, while Observables are used for streams of data.

• Promises return a single value, while Observables can return multiple values over time.

• Observables can be cancelled, while Promises cannot.

• Observables have operators like map, filter, and reduce, while Promises do not.

• Observables are lazy, meaning they only execute when subscribed to, while Prom...read more

Dependency injection in Angular allows for better code organization and testing by managing service instances efficiently.

• Dependency Injection (DI) is a design pattern used to implement IoC (Inversion of Control).

• In Angular, DI allows components to receive their dependencies from an injector rather than creating them directly.

• Types of DI in Angular include Constructor Injection, Property Injection, and Method Inje...read more