Ionic is an excellent solution for generating basic native functionality in an app that can operate on various devices and operating systems. The Ionic framework's key benefit is that we can construct the app once rather than many times for different devices and distribute it everywhere. It allows for a quick and cost-effective app development process.
We have divided the Ionic interview questions into the following section for your understanding,
If you're new to this profession or it's your first employment, you can anticipate being asked the following basic Iconic questions.
IONIC is just an HTML5 framework that allows web developers to create hybrid mobile applications. Hybrid applications are mini web pages that function in a web shell in the apps and have entry to the original performance surface.
Ionic Framework was developed by Max Lynch, Ben Sperry, and Adam Bradley for Drifty Co. in 2013.
|Ionic Polymerization||Free - Radical|
|Ionic polymerization is a chain polymerization in which the center contains ions and ion pairs.||Polymerizations created by adding free-radical building components are known as free radical polymerizations.|
|Ionic polymerization requires less activation energy than radical polymerization.||Initiators and co-initiators are used in free radical polymerization.|
|It's an alternative to polymerization by free radicals.||It's the only method to get diverse polymers and composite materials.|
Below given is the list of some of the applications that are built with the Ionic framework,
In the Ionic framework, services are essential since they provide information to our app and assist us with various tasks. Connectivity Monitor, Simple Alert, data, Google Maps, and others are among the protocols included in the ionic framework. There are some things to keep in mind when designing a service. The most critical steps are importing a service, adding a provider, and injecting it. It is necessary to import the services into the classes that will use them. It adds a new member variable that may be accessed anywhere in the class when injected into the procedure Object().
Storage in Ionic Framework is a simple way of storing keys, values, and JSON objects. Engines of many types are employed in this storage. The storage for the web application will most likely be IndexedDB, WebSQL, and local storage. The ionic framework offers a variety of storage options. These are some of them.
|Pros of Ionic framework||Cons of Ionic framework|
|Easy to learn||Performance|
|Built on AngularJS||Early adopter risk|
|User Interface||Not good for video games|
|Cross-Platform||Limited Native functionality|
The Ionic2 framework is superior to the Ionic1 framework for a reason. Here are some of the features included in the creation of the ionic2 framework.
The original Ionic CLI, or Command-Line-Interface, is a vital instrument for Ionic application development. It combines a variety of tools into a unified dashboard. Begin, create, publish, and execute are just a few of the essential functions for Ionic growth. And also has functions such as emulating information, and these can be useful under those circumstances. And it's in charge of cloud builds and deployments, as well as managing your Ionic pro subscription.
Given below are the advanced level Ionic Questions
The following are the features of the Ionic Framework
Ionic Framework V4 places a strong emphasis on performance, compatibility, and extensibility. The new features of Ionic 4 are listed below.
Ionic v1 apps are designed with AngularJS. Two of the several testing frameworks and libraries accessible with Angular are Jasmine and the Karma test driver. Such frameworks could be used to build a test suite for Ionic apps. Ionic apps can be evaluated in four forms: on a pc WebKit site, in an iOS or Android emulator, in a chrome website on your mobile, or as a native app on your phone.
Ionic-CLI additionally includes a continuous reloading feature that lets users test their app on the web page. For instance, the ionic service line is used to run the app on almost any website. We can use Chrome Developer Tools or Mozilla Firefox with Firebug to troubleshoot and explore Ionic apps.
Ionic 4 is built on the Angular framework, and it uses RouterModule, an Angular router module, for navigation. It improves the overall consistency of the application's routing. In previous versions of Ionic, the NavController service was used for navigation, and it is still available, albeit it will be deprecated soon. As a result, it will not be encouraged in new Ionic applications written with Ionic 4.
In the latest revision of Ionic, the ion-router-outlet element is being used to handle the effects that show as the user leaves to or from an element within the application. The ion-router-outlet is identical to the Angular router-outlet, except it has an animation effect added to it.
A full explanation of review architecture may be seen in the graphic below.
The ion-app> element is used to hold the whole Ionic app. Only one ion-app> element and various Ionic elements such as headers, footers, menus, content, and so on should be included in the Ionic project. Each of these elements is wrapped inside the ion-app> component when it is displayed.
<ion-app> <ion-header> //code </ion-header> <ion-content> //code </ion-content> </ion-app>
The Ionic grid system is a mobile-based flexbox system that may be used to customize a layout. A grid, rows, and columns are the three major aspects of the Ionic grid. The Ionic grid is a 12-column style with a variety of breakpoints based on screen size.
The below given key points are to be remembered while dealing with Ionic Grid,
Ans: By default, Ionic lacks a camera API. Because Ionic's plugin design is built on Cordova, we may be able to use Cordova plugins in our project. The Ionic team has put up a set of Cordova extensions that contain Angular wrappers, which you can get from ngCordova.In order to use Cordova plugins, we need to execute the Ionic command install plugin name>.
The plugin's Angular module might also have to be included in the Angular app in certain instances. We can even use the camera API using Cordova-plugin-camera, which is available on GitHub, to use a mobile phone's camera in an Ionic application. This plugin provides a universal navigator. camera entity to the system that includes an API for snapping photographs and choosing pictures from the system's photo library.
Observable is a class exported by the RxJS library. The RxJS library provides observables that aren't unique to Ionic or Angular. Promises are similar to observables, however, observables have a lot more capabilities. Rather than resolving a single value, it can handle many values at the same time. You can even update the data included in an observable by subscribing to it.
Observables are "lazy" in the sense that they aren't executed until they're subscribed to. A variety of operations can be used to modify observables and return a new one. You can even create your own observable.
The questions listed below are Ionic questions for Experienced
The ion-infinite-scroll component comes in handy if we need to present massive volumes of information in an Ionic application. This element allows information to be loaded into the app whenever the customer clicks particular distances from the top or bottom of the page.
All mobile apps necessitate a method for displaying a great volume of information with fewer clicks. The endless scroll is crucial to their success in this case. The endless scroll component accomplishes the same goal as if we were loading ten things on a single page. A fresh data request is triggered whenever the user scrolls down to the bottom of those items. This request gets the next batch of record entries to be combined with the ones already there. This process is repeated until the new material no longer appears in chunks as the user scrolls.
The best example of an ion-infinite scroll is the news feed section of Facebook, Instagram, or Twitter. The page automatically loads new entries as you reach the required distance, and a loading spinner appears at the bottom of the screen.
Lazy loading refers to the practice of loading items only when they are required. The basic idea behind this is that users don't have to download all web pages in the app once it's first started. Earlier versions of the Ionic framework recommended using the @IonicPage decorators to drowsy download your webpages, however in Ionic 4 we use Angular routing to lazy load our Angular elements. Every Ionic element is a web component that will be downloaded slowly when it is used in an Ionic app.
The routes in the tabs routing module are set up as follows:
In this design, each tab loads its children slowly, thus tab2's files aren't loaded until the user clicks on the tab2 page.
By breaking our software into smaller lazily loaded sections, we can avoid the browser needing to download, process, and compile it before the user interacts with the first page. This would considerably increase the program's first load time if our app was enormous.
Optimizing Lazy Loading:
When you import the Router module into the main app module, you can provide a pre-loading strategy. There are two that come pre-installed with Angular:
Debugging is an essential part of any software development process. When it comes to Ionic, we can debug Android and iOS apps using Chrome or Safari.
Android: Follow the steps below to debug an Android application in real-time.
iOS: To debug an iOS application in real-time, follow the steps below.
Ionic makes advantage of the Angular life-cycle events. These are the life-cycle events:
There are a few more lifecycle events that would prohibit users from gaining unwanted access.
In Ionic 4, Routing Guards can be used to replace the above two events.
Ionic Events is a publish-subscribe event system that allows you to send messages to numerous components and pages at the same time. It's a framework for broadcasting and responding to app-level events across your entire app, to put it another way. A number of Ionic events can be used to add user interaction. The table below summarises all of the Ionic events.
|Event Name||Event Details|
|on-hold||It is triggered anytime the touch lasts longer than 500 milliseconds.|
|on-tap||It is triggered anytime the touch lasts fewer than 250 milliseconds.|
|on-double-tap||When there is a double-tap touch, it is called.|
|on-touch||When the contact begins, it is immediately called.|
|on-release||When the touch is finished, it is termed.|
|on-drag||It's what happens when you slide your finger across the page without releasing it in any direction.|
|on-drag-up||When an element is moved up, it is referred to as.|
|on-drag-right||When an element is dragged to the right, it gets called|
|on-drag-left||When an element is dragged to the left, it gets called.|
|on-drag-down||When an element is dragged down, it is referred to as this.|
|on-swipe||When there is any dragging with a high velocity travelling in any direction, it is referred to as this.|
|on-swipe-up||When there is any dragging with a high velocity moving up, it is referred to as this.|
|on-swipe-right||When there is any dragging with a high velocity travelling to the right, it is referred to as this.|
|on-swipe-left||When there is any dragging that is travelling to the left at a high velocity, it is referred to as this.|
|on-swipe-down||When there is any dragging with a high velocity travelling down, it is referred to as this.|
As long as your program can be reverse-engineered, security is a common worry while creating hybrid apps.
An Angular application's structure is identical to that of an Ionic 4 application. The e2e, node modules, and src directories, as well as specific files like angular.json, ionic.config.json, package-lock.json, package.json, tsconfig.json, and tslint.json, will be found in the root directory. Files for conducting end-to-end integration tests can be found in the e2e/ folder, while node modules contain all requirements.
The src/app/ subfolder contains the majority of the application code you'll be writing. The major files in the application folder are app.module.ts, app.component.ts, app.component.html, app.component.spec.ts, and app-routing.module.ts. Services, components, and pages developed can be kept in their own directories. The assets/ subdirectory can be used to store images and other static content.
The topic of the research, app directory base route, origin base, routes for the index file, main.ts, polyfills, resources directory route, CSS stylesheet routes, script routes, build options, and so on are all contained in Angular.json. ionic.config.json could be used to establish proxy settings for APIs during development to eliminate CORS issues. package.json lists prerequisites and includes the functions serve, build, test, and e2e.
The following are some of the most essential ionic components:
Because Angular is significantly used in Ionic 1-3. The same compilation options were available for Ionic as they were for Angular.
JIT-based software is slower than AOT-based software. AOT, on the other hand, takes longer to compile than JIT. So, for short inspections, use JIT, and for final deployment, use AOT.
Ionic developers are in huge competition in the android application development marketplace. To successfully complete your upcoming Ionic interviews and achieve a job as a Smartphone App creator, Frontend Developer, and, of course, an Ionic builder, start preparing these Ionic framework interview questions and land in your dream job.
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