Which programming language is best for app development?

Answer 1

ios:
Objective-C
The iPhone — and all iOS programming for that matter — is written in Objective-C through Apple's Xcode integrated development environment (IDE)

android:

Java is the official language for Android App Development and consequently, it is the most used language as well. Many of the apps in the Play Store are built with Java and it is also the most supported language by Google

Answer 2

If you use the search bar I think you will find the answer .Thanks and happy coding:

https://www.sololearn.com/discuss/1316935/?ref=app
https://www.sololearn.com/post/52212/?ref=app
https://www.sololearn.com/post/10362/?ref=app
https://www.sololearn.com/post/432150/?ref=app