Interview Questions.

Question 1. What Are Hybrid Mobile Apps?

Answer :

Hybrid apps are actually developed the use of a mixture of the native and HTML5-based web capabilities. An HTML5 mobile app is basically an internet web page, or chain of internet pages, which can be advanced to run on a small display screen. Hybrid improvement unites the excellent and leaves the worst points of each the native and HTML5 systems. Hybrid app also can be called as a web app, which is to start with developed using HTML5 and JavaScript after which it's far wrapped in a lean native container that makes it accessible to local platform features as properly. Apart, from being a chunk slow platform in gaining access to NFC, Bluetooth, and so on and requires a 3rd birthday party plug-in, hybrid platform has handful of benefits. A hybrid application has a capability to broaden programs the usage of Android, Windows and Blackberry regardless of the aspect that each of the platform requires extraordinary development environment, language and framework. To get a outstanding presence inside the app keep with out spending giant attempt for growing a different app, organizations expand hybrid apps as wrappers for an current net web page. Moreover, hybrid apps also are popular because they allow go-platform development. That means, builders can reuse the equal HTML code additives on one of a kind cellular running systems, which in turn, reduces drastically the improvement charges. Tools like PhoneGap and Sencha Touch allow customers to layout and code across platforms, the usage of the strength of HTML.

Question 2. What Are The Most Prominent Advantages And Disadvantages Of Building Applications Using The Ionic Framework?

Answer :

The most apparent benefits are:

Ionic framework builds hybrid packages the use of net technologies. It means net builders can easily build mobile programs too. Also, as it uses JavaScript, nearly the identical codebase can be used to construct both iOS and Android programs.

Development price is less compared to local iOS and Android programs.

Ionic framework is extraordinary for short application ideas prototyping.

Some of the hazards are:

It isn't always applicable for excessive-quit portraits dependent applications or games.

Performances aren't as exact as native packages, namely animations, scrolling, and community operations.

As mentioned, JavaScript animations aren't as performant as native animations. However, there are JavaScript libraries, like tweenMAX, which offer decent animation overall performance at the gadgets.

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Question 3. Why Build Native Apps, When Hybrid Apps Development Frameworks Are There?

Answer :

Some of the subsequent couldn't be performed effectively using internet frameworks:

Access to platform-unique UI components, like maps, date pickers, switches, and navigation stacks.

Native cell gesture recognizers

Complex and complex threading fashions that help parallelize paintings onto more than one threads.

Question four. What Is The Difference Between Phonegap, Cordova, And Ionic?

Answer :

PhoneGap is a library that exposes native cellular telephone functionalities as JavaScript API. When Adobe purchased PhoneGap, its open source middle turned into donated to the Apache Software Foundation under the name Cordova. In the start, there has been almost no difference between Cordova and PhoneGap. Although, through the years of development, Adobe began adding a proprietary set of the offerings to PhoneGap. Today, it's far secure to say PhoneGap is Cordova plus extra Adobe services.

Ionic makes use of Cordova, not PhoneGap for its middle equipment. Beside native mobile telephone functionalities, Ionic offers structure and code scalability to JavaScript packages by way of the usage of AngularJS. It additionally provides a set of Angular directives and additives to hurry up software improvement.

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Question five. What Are Some Of The Disadvantages Of Building Native Apps?

Answer :

Even a small change wishes a recompile that slows up the builders. This emerge as a nightmare whilst the codebase is very huge.

Testing new functionality is bulky.

Calls between native and interpreted surroundings could emerge as blocking off UI thread.

IPHONE APPS Interview Questions
Question 6. How Do You Persist Data Between Application Launches Using Ionic Framework?

Answer :

As Ionic behind the scene builds HTML5 based packages, you could use localStorage and sessionStorage API to persist statistics on the cell phone. However, on the grounds that localStorage can handiest store strings, objects need to be stringified before saving. Also, it is essential to say localStorage has size limit round 5MB.

Question 7. How Do You Pass Data From One View To Another In Ionic Applications?

Answer :

Ionic makes use of AngularJS and UI-router. It method you can use Angular services or UI-router’s kingdom clear up to pass information from one view to another. Since Angular offerings are singletons, statistics saved in offerings can be accessed across other Angular controllers.

As noted, UI-router offers a solve configuration. For instance:

$stateProvider

.Nation(‘todos’, 

url: ‘/todos’,

controller: ‘TodosCtrl’,

templateUrl: ‘todos.Html’,

solve: 

todos: feature(TodosService) 

go back TodosService.GetTodos()

)

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Question 8. How Can You Render A 5000 Item List In Ionic, Without Affecting Scroll Performance?

Answer :

Ionic affords a collection-repeat directive that renders only seen gadgets in the DOM. So despite the fact that the listing is big, like 5000 in our example, most effective gadgets visible in a viewport are rendered. Thus, scroll performance isn't always affected.

Question nine. Give Some Examples Of Hybrid Mobile App Frameworks?

Answer :

Ionic
Mobile Angular UI
Intel XDX
Appcelerator Titanium
PhoneGap
Kendo UI
IOS Interview Questions
Question 10. What Is The Advantage Of Caching The Views In Ionic Apps? Provide Examples.

Answer :

Ionic by means of default caches up to 10 perspectives, which improves overall performance and also maintains distinct states in the views on the identical time. For instance, the cache can maintain scroll function within the views or energetic kingdom of buttons.

Caching may be disabled in line with view via the usage of cache: false in UI-router’s kingdom config, like inside the following example:

$stateProvider.Nation(‘myState’, 

cache: fake,

url : ‘/myUrl’,

templateUrl : ‘my-template.Html’

)

Caching may be additionally disabled globally, by putting maxCache to 0:

$ionicConfigProvider.Views.MaxCache(zero);

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Question eleven. How Can You Detect A Platform (android Or Ios) At Runtime In Ionic Application?

Answer :

Ionic provides platform classes: while the utility is loaded, Ionic provides CSS classes to the <body> tag. For instance, on iOS devices, Ionic adds platform-ios class to <body> tag. Ionic also provides OS version instructions including platform-ios8 (for iOS eight) and platform-android4_4 (for Android four.4).

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Question 12. How Can You Access Mobile Phone Native Functionality In Ionic Applications, For Example The Camera?

Answer :

Ionic does not offer a camera API out of the box. However, on account that Ionic makes use of plugins structure, and due to the fact it's miles based on Cordova, we will use Cordova plugins in our software. Ionic group affords a fixed of Cordova extensions with Angular wrappers, and that they may be located at ngCordova.

To use Cordova plugins, we need to install the plugin using Ionic command set up <plugin name>. In some cases, we can moreover want to add the plugin’s Angular module in your Angular utility too.

To use a mobile telephone’s camera in the Ionic application, we will call the digicam API by way of the usage of cordova-plugin-digicam this is hosted on GitHub. This plugin defines a international navigator.Digital camera object, which offers an API for taking photographs and for deciding on pix from the device’s picture library.

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Question thirteen. How Can You Test Ionic Applications?

Answer :

Ionic packages are built the use of AngularJS. Angular has a wealthy set of take a look at libraries and frameworks consisting of Jasmine and Karma test runner. These frameworks may be used to write unit assessments for Ionic applications. Also, ionic-CLI gives live reload function so the utility can be examined in the browser. For example, the ionic serve command can be used to load the application in any browser. Thus, we are able to use Chrome Developer Tools or Mozilla Firefox with Firebug to debug and investigate Ionic applications.

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Question 14. Performance Of Ionic Application Is Bad On Older Android Devices. Why Is This, And What Can Be Done To Improve It?

Answer :

Ionic framework makes use of the default web browser available for the device to run its hybrid application. Older versions of Android devices (four.Zero-4.3) use Android’s default browser, which has significantly much less overall performance and standards compliance than the present day Chrome browser.

One way to clear up this problem is to use crosswalk together with Ionic framework. Crosswalk permits you to bundle a present day Chrome webview along with Ionic utility, so an application does now not must rely on local Android browser. The cease outcomes are a whole lot better performances and cutting-edge web API throughout all Android variations.

Question 15. What’s The Difference Between “ionic Build” And “ionic Prepare”?

Answer :

ionic prepare <platform> copies all documents from the www folder into the target platform’s www folder.

Ionic construct <platform> also does this, but additionally builds the app’s source code so that it is able to be run on a simulator/emulator or a tool.

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Question sixteen. How Are Hybrid Apps Different From Building Native Apps And Mobile Websites?

Answer :

Native Mobile Apps:

An software software evolved for use on a specific platform or device is basically a Native mobile application. Since local apps are evolved by way of using a specific platform, they are able to take benefit of the tool particular software and hardware. That way- they could use in-built software program and packages like – worldwide positioning device (GPS) and digital camera. One of the first-rate parts of local programs is that they're quicker and particular to structures like Android and iOS and so on.

They are generally developed with the aid of the usage of included improvement environment (IDE). IDEs are pleasant known tools for providing offerings like- challenge development, constructing debugging, model manipulate and lots of others. However, iOS and Android packages are generated by way of the usage of specific languages and IDEs, there’s a whole lot of similarity within the strategies and the improvement surroundings. So, exploring the differences of the 2 languages isn't a pre considered necessary. By in reality the usage of the tools required with the aid of the gadgets, programmers can develop local apps, which are at times tough to increase.

Mobile Web Apps:

Web apps are without a doubt not actual packages; they're honestly web sites. Their appearance and sense is like local applications, but they're no longer implemented in a similar manner as native apps are implemented. They run through a browser and are usually written in HTML5. Mobile web apps may be accessed usually as users get right of entry to any net page. To deploy the app, users are needed to navigate to a special URL and there they get the choice of “putting in” the app on their home screen by means of developing a bookmark to that web page.

Basically, net apps became famous when HTML5 got here and people found out that they are able to get local like functionality within the browser. Nowadays, when more and more websites use HTML5, the difference between internet apps and regular net pages has end up blurry.

Hybrid Mobile Apps:

Hybrid apps are absolutely advanced using a combination of the native and HTML5-primarily based net capabilities. An HTML5 cellular app is essentially an internet page, or chain of net pages, that are advanced to run on a small screen. Hybrid improvement unites the fine and leaves the worst points of both the native and HTML5 systems. Hybrid app can also be referred to as as an internet app, that is to start with developed using HTML5 and JavaScript and then it's far wrapped in a lean local box that makes it available to local platform capabilities as nicely.

Apart, from being a bit gradual platform in getting access to NFC, Bluetooth, etc and calls for a third party plug-in, hybrid platform has handful of blessings. A hybrid software has a ability to broaden applications the use of Android, Windows and Blackberry notwithstanding the issue that every of the platform calls for different improvement environment, language and framework.

To get a distinguished presence in the app save without spending sizable attempt for growing a unique app, groups increase hybrid apps as wrappers for an present web web page. Moreover, hybrid apps also are popular because they permit move-platform development. That method, developers can reuse the same HTML code additives on one-of-a-kind cellular running structures, which in flip, reduces considerably the development fees. Tools like PhoneGap and Sencha Touch allow customers to layout and code across systems, using the strength of HTML.

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Question 17. What Is Ionic Framework?

Answer :

Ionic is a Cordova or Phonegap based totally framework that lets in you to construct move-platform programs for android, ios and home windows or essentially another platform that Phonegap helps. It is one hundred% unfastened and open supply challenge, certified below MIT.Ionic allows developers to build stunning and interactive mobile application the use of HTML5 and AngularJS. Ionic helps over 120 native device features like Bluetooth, Health Kit, Finger Print Auth, and more with Cordova/Phonegap plugins and TypeScript extensions.

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Question 18. Ionic Framework Developed By Whom?

Answer :

Ionic changed into evolved by Max Lynch, Ben Sperry, and Adam Bradley of Drifty co. It turned into advanced in 2013. It is open source software which is used for hybrid cell app development. It is built on Angular JS and Apache Cordova. Ionic is a set of Angular.Js, UI Router, Angular directive, Angular services, JS utilities, and cellular-focused CSS patterns.

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Question 19. How To Get The Installed Version Of The Ionic Framework?

Answer :

You can get hooked up model of Ionic framework by strolling ionic.Model in console of your web browser.

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Question 20. What Is The Difference Between Ionic Polymerization And Free-radical?

Answer :

A chain of polymerization in which energetic centers are ions is referred to as ionic polymerization. The ions may be anions or cations.

In free-radical polymerization, the building blocks are the free radicals which form polymer chains.

Phonegap Interview Questions
Question 21. List Some Popular Apps Built With Ionic Framework?

Answer :

Here is going a listing of a few popular packages built with the help of ionic framework: –

Pacifica: Cognitive Behavioural Therapy.
TD Trading: Stock Trading App.
Sworkit: Workout and Fitness Plan.
Market Watch: Stock Market and Business News.
Chef Steps: Cooking Tutorials and Tool.
Nationwide: Insurance and Financial Services.
Just Watch: Streaming Search Engine.
Untapped: Social Discovery and Check-in Network.
National Museum of African American History and Culture.
Crypto trade: Crypto currency Tracker.
Question 22. How To Use Service/companies In Ionic?

Answer :

Services play an important role in Ionic framework as they provide records to our application and carry out various duties for us. Connectivity Monitor, Simple Alert, facts, Google Maps, etc. Are a number of the services that are built in ionic framework. There are few ideas that are to be stored in thoughts even as creating a provider. Importing a carrier, adding a provider to it, and injecting it are the most important element. The services must be imported inside the classes in which they are for use. When it's miles injected inside a constructor, a brand new member variable is created which may be accessed from everywhere within the elegance. A provider can be delivered in a carrier through  approaches. Either it may be brought to an character factor, or it could be delivered globally to the application whilst bootstrapping the foundation issue.

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Question 23. How Many Types Of Storage Available In Ionic Framework?

Answer :

The smooth manner to keep key or values and JSON gadgets is called garage in Ionic Framework. In this diverse garage, engines are used. While at the web software, the garage will tend to apply IndexedDB, WebSQL, and nearby storage. Various kinds of garage are available in ionic framework. Some of them are –

HTML5 local storage
Cookie and session storage
IndexedDB
WebSQL
PouchDB
Web provider/api garage
Cordova storage.
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Question 24. List Some Advantages And Disadvantages Of Ionic Framework?

Answer :

Everything has a few professionals and cons.

Some advantages and disadvantages of ionic framework are listed underneath:–

Advantages:

All the supported platforms have best one source. Mainly they're android and OSX.
It is particularly advanced in HTML, CSS, and JS. Almost all the developers are familiar with these languages.
Most importantly, angular is getting used that's with the aid of default embedded within the ionic framework.
It is absolutely unfastened and is considered as one of the exceptional open-supply software for developing hybrid mobile applications.
Disadvantages:

There is a performance gap between the ionic and the native programs. Ionic apps are not as rapid because the local apps.
Ionic programs might not be as cozy as the native applications.
The ionic applications may additionally lack in some local features. In such case, plugins must be advanced.
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Question 25. What Are The New Features Included In Ionic2?

Answer :

There is a cause why Ionic2 framework is better than the Ionic1 framework. Here are a few capabilities which have been covered in the ionic2 framework when it was being advanced.

Ionic2 framework consists of lessons not like ionic1 which has controllers.
In ionic2, every element has its very own folder and its very own class record.
In ionic2, you can robotically generate pages, carriers, tabs, pipes, additives, and directives.
In this, extra native method is used for navigation.
Ionic2 is simply simple antique JavaScript.
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Question 26. What Is The Current Stable Version Of Ionic Framework?

Answer :

Ionic presently requires Angular JS so as to paintings as its complete capability. The cutting-edge stable model of the ionic framework is ionic three.0. It turned into launched on twenty fourth February, 2017. It facilitates you construct native-feeling mobile packages using web technologies. It specially focuses on the appearance and sense, and the person interface of your software.

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Question 27. How To Use Observables In Ionic Framework?

Answer :

Observables are something that aren't precise to Ionic or Angular and are provided through the RxJS library. Observables are nearly just like the promises but can do plenty extra. It can address more than one values at a time as opposed to just resolving one value. You can even subscribe to an observable to manipulate the information that's related to it. Observables are taken into consideration to be “lazy”, i.E. They gained’t get done till and unless they're subscribed to. Various operations can be carried out to the observables for enhancing it and returning a brand new one. You can even create your personal observable. The observable styles are blended into one with the assist of subject that's preferred for simple implementations.

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