Birlasoft Angular Developer Interview Questions and Answers

Angular life cycle hooks are methods that allow you to tap into specific points in a component's life cycle.

• ngOnChanges: called when an input property changes

• ngOnInit: called once the component is initialized

• ngOnDestroy: called before the component is destroyed

• ngAfterViewInit: called after the component's view has been fully initialized

The digest cycle in Angular is the process where Angular checks all the watchers in the scope for changes and updates the view accordingly.

• During the digest cycle, Angular compares the current value of the watchers with the previous value to detect changes.

• If a change is detected, Angular updates the view to reflect the changes.

• The digest cycle continues until all watchers have been checked and no more changes are dete...read more

Number vs parseInt: Number converts a string to a number, parseInt parses a string and returns an integer. Find vs Filter: Find returns the first element that matches a condition, Filter returns all elements that match a condition.

• Number vs parseInt: Number('10') returns 10, parseInt('10.5') returns 10

• Find vs Filter: [1, 2, 3, 4, 5].find(num => num > 3) returns 4, [1, 2, 3, 4, 5].filter(num => num > 3) returns [4, 5]

Promises are objects representing the eventual completion or failure of an asynchronous operation. Types refer to the data types in TypeScript.

• Promises are used for handling asynchronous operations in JavaScript.

• They can be in one of three states: pending, fulfilled, or rejected.

• Types in TypeScript help catch errors early by enforcing data types at compile time.

• Examples: Promise.resolve(), Promise.reject(), string, num

Create a reactive form in Angular to save data in API with validation

• Create a reactive form using FormBuilder in Angular

• Add form controls with proper validation rules using Validators

• Handle form submission and send data to API using HttpClient

• Implement error handling for API requests

• Display success or error messages to the user

Auth-guard is a feature in Angular that controls access to routes based on user authentication status.

• Auth-guards are used to protect routes in Angular applications by checking if a user is authenticated before allowing access.

• They can be implemented using canActivate interface in Angular.

• Auth-guards can redirect unauthenticated users to a login page or display an error message.

• They are commonly used in applications wi...read more

There are multiple ways to communicate in Angular components, including Input, Output, ViewChild, and Services.

• Input - parent component can pass data to child component using @Input decorator

• Output - child component can emit events to parent component using @Output decorator

• ViewChild - parent component can access child component using @ViewChild decorator

• Services - components can communicate through shared services

Use JavaScript to find the longest word in a string.

• Split the string into an array of words using split() method.

• Iterate through the array and compare the length of each word to find the longest one.

• Return the longest word found.

I started my career as a web developer, specializing in frontend technologies like Angular. I have worked on various projects and gained valuable experience.

• Started career as web developer

• Specialized in frontend technologies like Angular

• Worked on various projects

• Gained valuable experience

I have expertise in developing Angular frontend applications with strong knowledge of TypeScript, HTML, CSS, and Angular frameworks.

• Strong knowledge of TypeScript, HTML, and CSS

• Experience in developing Angular frontend applications

• Familiarity with Angular frameworks like AngularJS, Angular 2+, Angular Material

• Understanding of reactive programming and observables in Angular

• Knowledge of state management with tools like N