If you are in search of the most famous single-page application framework for Java, Angular is the one you should be considering. It is a typescript-based web application framework that is front-end. It targets both the server and the browser and is also vast as well as challenging to navigate.
With thousands of developers continuously contributing to its community project, Angular is considered as one of the most famous frameworks for user interface design today. The unmatched performance and the compelling features have made it a vital tool for any web developer to have in their arsenal. However, the navigation could be easier.
But, what is more difficult is to be in a situation where you have an interview question on Angular and need to know the answer. Don’t fret. In this blog today, we will take a look at the important Angular interview questions and answers to help you on your journey to get ready for the big day.
Technologies used in Angular
Angular is considered the modern front-end framework of Java that Google built. Angular itself makes the utilization of various technologies for various reasons to get done with certain tasks effortlessly as well as to enable the developers to have a much better experience while developing applications using it.
Angular utilizes Typescript, which is basically the superscript of JavaScript. Therefore, any JavaScript that is valid is a typescript that is valid. However, Typescript enables us to write JavaScript as a strongly typed language. With JavaScript, we can define our own type as well, which makes it easier to catch bugs. It also utilizes RxJS, which empowers developers to tackle asynchronous operations better.
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Advantages of Angular (over others)
Here are some of the advantages of using Angular over the other frameworks:
- Many features are granted out of the box. Angular offers an abundance of built-in features, such as state management, routing, HTTP services, and rxjs library straight outside the box. It implies that an individual does not need to check for these features separately, as all of them come with Angular.
- Angular utilizes HTML to render the user interface of an application. HTML is considered a declarative language and is much simpler to use than JavaScript.
- There is long-term support from Google. Google has already announced its strong support of Angular. It implies Google wants to stick with the framework and scale up the ecosystem surrounding it.
Why were client-side frameworks like Angular introduced?
Way before the JavaScript client-side frameworks, the dynamic websites’ processes worked by taking a template that is nothing but HTML code with spaces that are kept empty for feeding content and data into those templates. This data was actually fetched from a database.
After combining data with the template, we would serve the HTML content that was generated back to the user. It may seem a little complicated. And in some scenarios, it usually takes a lot of processing.
To overcome such issues, individuals came up with other ways to send the required data to render a page to the web browsers from their web servers and allow JavaScript to accumulate this data with an already defined template. Even smartphones are now capable of this sort of processing. Therefore, these days, servers can just send the data to a client over the internet. This massively decreases the processing done on servers and enhances performance.
What are single-page applications?
Single-page applications are basically applications that are based on the web, and they only require to be loaded once, with new functionality consisting of only little changes to the user interface. It does not proceed to load new HTML pages to showcase the new page’s content. Instead, it generates that content dynamically. It was made possible by the ability of JavaScript to other DOM components on the current page. A SPA or Single Page Application procedure is speedier, resulting in a more consistent user experience.
What is Metadata in Angular?
Utilizing Metadata is how we instruct Angular on how to process a class. When we utilize a component, it works as a class unless we instruct or tell that it is a component. We accomplish this with the help of Metadata. Metadata is connected to TypeScript using a decorator. Decorators are functions that know the class configuration and how the working process is supposed to be.
What are the templates in Angular?
A template is a sort of HTML that instructs Angular on how to display a component. An Angular HTML template, such as conventional HTML, develops a view or a user interface in the browser but with many more capabilities. Angular API tests an HTML template of a component, builds HTML, and renders it. There are basically two sorts of templates in Angular:
● Inline Template
The component decorator’s template config is utilized to signify an HTML inline template for a component. The template will be wrapped inside the double or single quotes.
● Linked Template
A component may comprise an HTML template in a different HTML file. The template URL feature is utilized to show the path of the HTML template file.
How can you transfer components to custom elements?
Two vital steps need to be followed if you wish to transfer components to custom elements:
- For the first step, you are required to develop a custom element class utilizing the function known as createCustomElement(), which Angular provides. The feature transforms the Angular component into a custom element. The interface known as NgElementConstructor gets implemented via this transformation, which, in turn, develops a constructor class that is utilized to produce a self-bootstrapping instance.
- The customElements.define() is used to register the configured constructor and is associated with the custom-element tag with the browser’s CustomElementRegistry.
Wrapping up
Preparing for interviews and tests may seem scary. However, it doesn’t need to be if you do your due practice and prepare well. While many important Angular questions and answers might be asked in the interview, the questions mentioned above are a must for every candidate.
