Very different domains. Web and app developers code apps connecting net front ends to databases. JS front end and maybe obj-c/swift/c#/python/ruby/perl for the

Very different domains. Web and app developers code apps connecting net front ends to databases. JS front end and maybe obj-c/swift/c#/python/ruby/perl for the middle tier. R is domain specific to stats/econometrics/engineering/data analysis. It competes with matlab, c++, maybe fortran and recently python.