Java is easy to learn. Java was designed to be easy to use and is therefore easy to write, compile, debug and learn than other programming languages..

Java is object-oriented. This allows you to create modular programs and reusable code.

Java is platform-independent.

Java is cheap and economical to maintain

Java offers a very effective boon to its users by providing the feature of platform independence that is Write Once Run Anywhere(WORA) feature.

Kotlin is getting high popularity among all level of programmers.

Cross-platform Mobile applications.

Kotlin works on different platforms (Windows, Mac, Linux, Raspberry Pi, etc.) and it's 100% compatible with Java.

Kotlin supports object-oriented and functional constructs and very easy to learn.

Kotlin is mature enough to build an interoperable application in a less complex manner.

Class and objects creation meta class creation is automated and easily managed during run time in Objective C language. Hence making the coding writing method easy for developers.

Dual features of dynamic and static typing Objective C fully supports the dynamic typing features. Initially it is not easy to know about objects that is going to use at run time. Therefore with the help of dynamic typing, we can declare a variable that can hold a reference to an object.

Simple to understand Objective C another main feature is the Smalltalk style messaging that are making this language very simple. Those who have a less understanding about multiple inheritance and overloading can go for Objective C because it isn’t possible within the language.

Swift 4 makes use of safe programming patterns.

Swift 4 provides modern programming features.

Swift 4 provides Objective-C like syntax.

Swift 4 is a fantastic way to write iOS and OS X apps.

Swift 4 provides seamless access to existing Cocoa frameworks.

Swift 4 unifies the procedural and object-oriented portions of the language.

Swift 4 does not need a separate library import to support functionalities like input/output or string handling.

You can use the existing JavaScript knowledge to build native mobile apps.

You can share most of your code on different platforms.

The community around React and React Native is large and you will be able to find any answer you need.

A If you want to create native functionality which is not created yet, you will need to write some platform specific code.

Dart has a large repository of software packages which lets you to extend the capabilities of your application.

Developers need to write just a single code base for both applications (both Android and iOS platforms). Flutter may to be extended to other platform as well in the future.

Flutter needs lesser testing. Because of its single code base, it is sufficient if we write automated tests once for both the platforms.

Flutter’s simplicity makes it a good candidate for fast development. Its customization capability and extendibility makes it even more powerful.

With Flutter, developers has full control over the widgets and its layout.

Flutter offers great developer tools, with amazing hot reload.

Ionic is used for Hybrid App Development. This means that you can package your applications for IOS android, Windows Phone and Firefox OS, which can save you a lot of working time.

Starting your app is very easy since Ionic provides useful pre-generated app setup with simple layouts.

The apps are built in a very clean and modular way, so it is very maintainable and easy to update.

Ionic Developers Team have a very good relationship with the Google Developers Team and they are working together to improve the framework. The updates are coming out regularly and Ionic support group is always willing to help when needed.