Objective-C is the primary language used by Apple to develop apps for Mac OS X and iOS. At this point, we cant forget Swift programming which is alternative of Objective-C. Working with Apple required Objective-C language knowledge. The Average salary of an IOS developer starts from $95,000 per annum.
4. Ruby (on Rails)
R is an open source language. R is most used by data scientists for data processing and statistical analysis. R is also used for developing server-side applications. So if you interesting in data science then you should go with R for a huge paycheck. The Average salary of a R developer starts from $100,000 per annum.
Perl is a very powerful and reliable language. Perl is a scripting language, used for systems administration, network programming, finance and graphical programming. The Average salary of a Perl developer starts from $105,000 per annum.