It is known that all mobile operating systems have their own language for developing applications: Objective-C for iOS but now, of course, Swift, Java for Android, C# for Widows Phone. When creating even the most straightforward application, you need to keep in mind the peculiarities of developing in these languages and maintain uniform functionality on all platforms. The problems in this approach are obvious: additional development time, the complexity of supporting the application in the future, and the inability to reuse the code.
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