30+ Ionic Interview Questions and Answers [2023]?

Advance Ionic interview questions
Developer(s):	Drifty
Initial release	2013
License	MIT License
Stable release	6.1.12 / 29 June 2022; 12 days ago
Written in	TypeScript, JavaScript

Are you looking for the best Ionic interview questions and answers for beginners, intermediates, and professional programmers? Generally, attending an interview can be a tense moment in your life, and you don’t want to miss any questions. For this reason, we have sampled the best, most common, and most helpful Ionic interview questions and their answers that will help you get your first job as a developer. go through each of them and get ready to pass the interviews

1. What is Ionic Framework? 

It’s an HTML5 platform for developing hybrid mobile applications. Hybrid apps access the native platform layer and ruin the apps’ browser shell. In other words, the Ionic framework can also be defined as a powerful html5 SDK for building mobile apps through JavaScript, CSS, or HTML. It also concentrates on the UI interaction, the feel, and the look of the application. The Ionic framework can be used for commercial and personal purposes for free under the MIT license. 

2. What do you need to learn Ionic?

Ionic was developed over Apache Cordova and AngularJS, meaning you need the knowledge of these two platforms to learn about Ionic. Furthermore, you should be knowledgeable about JavaScript, CSS, and HTML to be able to learn Ionic. 

3. Is Ionic the best framework?

Unlike other frameworks, Ionic is a far better option for those seeking to develop applications for both commercial and personal use. However, Ionic is a better option because of the following reasons;

• Support multiple platforms: mobile applications coded from the Ionic framework are compatible with various platforms, including and not limited to Android, iOS, and Desktop platforms using a single code base. 
• Standard and reliable: Ionic framework relies on standard web technologies, including JavaScript, CSS, and HTML; this allows Ionic mobile apps to have constant API. As a result, they can function on multiple platforms.
• Cordova plugin: with this impressive feature, it’s easier to call native device functionalities from the JavaScript code using the API. 
• Open source framework: Ionic framework has an open source framework and a free MIT license. As a result, app developers can use the Ionic framework without worrying about its cost for personal or business use. It’s, therefore, possible to develop as many features of the app as possible.
• Predesigned components: it comes with predesigned features such as themes and typography that allow easy and quick app creation.
• Ionic CLI: also known as the Ionic Command Line interface, facilitates the development and emulation of Ionic apps.
• JavaScript components: This framework is equipped with JavaScript components, making it easier to design unique app features that can’t be coded using CSS or HTML.

4. What is lazy loading as used in Ionic?

It’s a concept in Ionic where the developer only loads pages required when the application is launched. This prevents the application from lagging behind and instead performs faster and with only the features the user needs. Lazy loading was done by @IonicPage Decorator, but the latest versions of Ionic use Angular routing to load the Angular components.

5. What is the popular mobile application built using the Ionic framework?

• Sworkit: build fitness and workout plans
• Cryptochage: designed for cryptocurrency tracker
• Just watch: used for streaming search engines
• Pacifica: intended for cognitive behavioral therapy

6. How do you test Ionic apps?

Ionic v.1 apps are codded using AngularJS, full of test libraries like Karma and Jasmine test runner. Using these libraries and frameworks, the developer can write unit tests with the intent of testing Ionic applications. Both live to reload, and Ionic serve commands can help you to test the Ionic apps.

7. Differentiate between Ionic prepare and Ionic build

Ionic build serves the role of Ionic preparation and also builds the app’s source code enabling the app to run over a device’s simulator. On the other hand, Ionic prepares copies of the www folder file to the www fielder of the target platform

8. Does the Ionic framework have storage types?

Yes, and in fact, it supports both internal and external data storage

• Internal storage: SQLite
• Session and cookies
• External storage: IndexedDB, MySql, WebSQL, PouchDB and MongoDB

9. What is the Ionic market?

The Ionic market offers themes, ready starters, plugins, and other addons that developers download and use on their Ionic projects. 

10. What are the basic Ionic components?

Ion-alert: this is a dialogue that notifies users to decide or gives them the ability to choose from 

•  A list of actions. It’s normally on the top part of Ionic apps but can also be manually disabled by the users before they can access other app features.
• Ion-button: This is a way to navigate through the app’s pages. It shows the user the actions that will occur when they press or click the listed button. Normally, the button may be icons, text, or both. Furthermore, the ion button can be customized with size, shape, and color attributes.
• Ionic content: it serves as a container and summarizes everything the developer needs to create in the app. It also has methods that can be used to control the scrollable canvas. There should be strictly one content component in every view.
• Ion-list: list comprises multiple rows of data or items that can include buttons, texts, icons, thumbnails, toggles, and many more. These elements are used to display tabs and menus or break the monotony. It allows for swiping items, dragging, and deleting the items.  
• Ion-input: it’s a component that securely collects and handles user input. It only allows text-type inputs like numbers, passwords, email, and URLs.

11. What are the advantages of the Ionic framework?

• The major advantage of the Ionic framework is that its free and open-source software is capable of easily and quickly creating hybrid mobile apps.
• Ionic framework is mainly JS, CSS, and HTML, that almost all developers are familiar with
• Ionic applications are easy to maintain and update
• Angular is embedded in the Ionic framework by default.

12. State the disadvantages of the Ionic framework

• Ionic apps aren’t as safe as native apps.
• Apps created using an Ionic framework don’t run fast as native applications.
• It’s tricky and challenging to test Ionic apps as the browser may not provide accurate data about the device environment.
• Some Ionic apps lack native functionalities meaning the developer must build a plugin to enjoy the full functionalities of that app.  

13. What are native apps?

These are applications that are designed for a specified device or platform. These apps are specific to a given pheons software and hardware since they are solely designed using a given platform

14. What role does AngularJS play in Ionic applications?

AngularJS creates a suitable environment for testing Ionic applications because it’s designed with test frameworks and libraries.

15. What are mobile web apps?

These are websites but not applications; they look and feel like native apps. However, the nature in which they are implemented isn’t different from native apps. Sometimes, web apps are often referred to as mobile websites.

16. What are hybrid apps?

These are applications that are created using HTML5 and native-based web features. HTML5 refers to a collection of web pages created to support and run on smaller screens. These apps are sometimes referred to as web apps.

17. What are page life-cycle events? 

Ionic utilizes the life cycle events offered by the Angular and the common life-cycle vent, including;

• ngOnInit: it fired once when the component was initialized
• ionViewWillEnter: this is initiated once the component routing-to is almost animating to view
• ngOnDestroy: this, if fired before the destruction of the view by the Angular
• onViewDidEnter: initiated after the component routing is done animating

18. What is web view, and what it’s importance?

This is a view that displays web pages within your Ionic application. Web view turns your Ionic apps into web apps. Developers can use web views to build or modify their applications using web technologies like HTML, CSS, and JS while still preserving them as native applications. 

19. What are promises in Ionic?

Promises allow developers to use asynchronous functionalities in JavaScript. It calls the .catch and .then services. It’s used as a callback handle and does something asynchronous with a service.

20. What’s the latest Ionic framework version, and what’s unique about it?

Ionic 6 was launched in Dec 2021 and still stands as the latest Ionic framework version. Some of the new features oners would expect from it includes

• Quick updates: it is much easier to migrate to versions 4 and 5 because it features fewer changes.
• iOS design changes: refresher styles, dark mode modal styles, and updated toolbar are among the added features for iOS mode. A collation option has been included in the header and footer, which hides the header and footer until scrolled by the user.
• Newer Component features: added features like a bottom sheet, select, model, and popover have been added in the Ionic version 6
• Reliable release cadence: this feature has been modified to relate to iOS and Android releases. As a result, it’s easier the release yearly Ionic updates.
• Customized elements build: this feature allows users to include essential elements in their applications.

21. What are AOT and JIT

AOT, also known as Ahead of time compiler, is a compellation type used during build time. On the other hand, JIT or Just In Time compiler 

is a compilation type in which the compilation is done on the browser at run time.

22. What is the capacitor in Ionic?

This cross-platform application allows the building of web apps capable of running natively on Androids, the web, iOS, and the Electron using a single source code. They can also be referred to as native progressive web applications, which are much better than hybrid apps. 

23. How can you transfer data between Ionic pages?

For every mobile application, it’s important to transfer its state between the pages or components. However, there are a few ways of doing this 

a transfer that includes the use of navigation controllers and the use of services. 

24. What is the router link directive?

This is a directive offered by RouterModule in Ionic. It allows developers to link to the routers within our template in the same way as the href attribute used in HTML.

25. Who created the Ionic framework?

Max Lynch, Adam Bradley, and Ben Sperry developed an Ionic framework in 2013 for the drifty Company. And ever since, it has served the needs of many who rely on it to create their commercial or personal web applications. 

26. What’s an <ion-app>?

These are the elements that hold the Ionic apps. However, strictly one ion-app > element plus various Ionic elements (including menus, content, headers, and footers) can be added to any Ionic project.

27. How can you improve Ionic mobile app performance?

• Compress & resize images
• Reduce HTTP requests
• Use lazy loading
• Use loading validation
• Re-use data templates
• Cache images
• Create an offline mode

28. Can you use Firebase with Ionic?

Ionic framework is compatible with firebase, and you can use it when developing your application. It’s among the most popular and powerful databases on the market. Developers can install, import, or use it within Ionic projects.

29. Compare Ionic and Apache Cordova.

These are two powerful and widely used app development technologies. Combining Apache Cordova and Ionic creates a powerful hybrid application. There is atone of developers who use both the frameworks. 

30. What is Ionic CLI?

Ionic CLI refers to a command line interface, and it comes with several commands that enable developers to create unique projects, add providers, components, pipes directives, and many more. CLI is essential for running, compilation, debugging, building, and deploying applications

FAQs

Conclusion

If you were worried and had no idea where to start, the top 30 best Ionic interview questions for intermediates and advanced developers can help you. You are good to go with the answers to most questions asked during an Ionic interview.