Angular Interview Questions And Answers

Angular Interview Questions For Freshers

Let us start with some basic Angular interview questions for freshers and candidates with little to no work experience:

In Angular, directives refer to the attributes that allow users to write new HTML syntax for their applications. The directives are executed when the Angular compiler finds them in the DOM. There are three directives supported by Angular – Component Directives, Attribute Directives, and Structural Directives.

In Angular, an AOT (ahead-in-time) compiler is a component that converts the Angular HTML TypeScript code into JavaScript code during its build phase. This takes place before your browser downloads and runs the code.

Here are a few key benefits of AOT compilation in Angular:

  • It leads to faster rendering
  • It facilitates the quick detection of template errors
  • It offers better security
  • It reduces asynchronous requests
  • It reduces the Angular framework download size

This is one of the most common Angular MCQ questions you can encounter while appearing for an interview/test. Angular components are the building blocks of a user interface in an application. Each component is a subset of directives and is associated with a dedicated template. In an Angular application, there is one root component (also called the AppComponent) that branches out to form other components, creating a hierarchy.

It is a framework, so Angular It is a framework, so Angular In Angular, pipes refer to simple functions designed to accept input values, process, and return in the form of output. The output here is a more transformed value. The Angular framework supports multiple built-in pipes and also allows users to create custom pipes according to their requirements.

It is a framework, so Angular Key features of Angular pipes include:

  • They are defined with the “|” symbol
  • A pipe can be chained with other pipes
  • Developers can provide them with arguments using the “:” sign

Pure Pipes are the pipes using pure functions in the Angular framework. They do not use any internal state, with the output remaining the same as long as the parameters stay the same, too. The framework calls these pipes only upon detecting a change in the parameters being passed.

While detecting every change in Angular, developers call an impure pipe irrespective of the change in the input fields. They create multiple pipe instances for such pipes. All inputs passed through them are mutable. While all pipes are pure, you can specify impure pipes with the help of the pure property.

Angular Interview Questions For Experienced Professionals

Here are a few important Angular coding interview questions suitable for experienced professionals looking for high-level AngularJS jobs:

The Ahead of Time (AOT) compilation lets you convert your code during its build time before your browser downloads and runs it. This leads to faster rendering to your browser. You need to include the --aot option with the ng serve or ng build command to specify this compilation.

JIT (Just in Time) compilation, on the other hand, is the process of compiling computer to machine code during execution or run time. Also known as dynamic compilation, JIT compilation is the default function when you run ng serve or ng build CLI commands.

Angular services are used by developers to perform tasks used by multiple components. These tasks could include multiple activities, from data and image fetching to database connections and network connections. As they perform every operational task for all components, developers are saved from rewriting the codes. You can write a service once and inject it into all components using that service.

Eager loading is the default module-loading strategy in Angular. Here, users can load feature modules under Eager loading before the application starts. Eager loading is generally used for small-sized applications.

Lazy loading, on the other hand, loads the feature modules dynamically when there is a demand for the same, making your application run faster. It is ideal for bigger applications where you do not need all modules at the start of the application.

DOM stands for document object model. It treats an HTML or XML document like a tree structure where every node works as an object representing a specific part of the document.

Angular uses the regular DOM which updated the entire tree structure of the HTML tags until it gets the data to be updated. However, Angular implements a change direction to ensure that the performance and speed are not affected.

In Angular, RxJs refers to a library that gives you reactive programming support for your Angular applications. It lets you work with asynchronous data streams and manage events over time. RxJs is based on data streams called Observables. These streams can be subscribed to and processed with the help of operators. This provides Angular developers with a flexible and powerful way of handling complex and asynchronous operations.

Frequently Asked Questions

Why are Angular developers high in demand in 2023?

In the digital age, organizations across the globe are dependent on software solutions for performing almost all processes. This increases the need to build new and relevant applications at a faster rate. Angular developers help their clients build robust applications without writing long and complicated lines of code. This lets them develop software solutions at a faster rate without compromising their quality and performance.

What is the salary of an Angular developer in India?

In the digital age, organizations across the globe are dependent on software solutions for performing almost all processes. This increases the need to build new and relevant applications at a faster rate. Angular developers help their clients build robust applications without writing long and complicated lines of code. This lets them develop software solutions at a faster rate without compromising their quality and performance.

Name a few popular companies using the Angular framework to build their applications.

Here are some of the biggest industry players that use the Angular framework to build their applications:

  • Microsoft
  • Delta
  • PayPal
  • Google
  • Upwork
  • Delta Airlines
  • JetBlue
  • Deutsche Bank
  • Santander Bank
  • Forbes

Is the job of an Angular developer sustainable?

The job of an Angular developer is sustainable only if you upskill yourself and get trained in the latest technologies. Staying in sync with the ongoing tech trends will leverage your skills as an Angular developer, adding more value to your services. This will make your career future-proof and provide you with several opportunities for sustainable professional growth.

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