I googled but could not find any functions in Julia that can read and write R RData (RDa) files. Is there a library / function / package that can allow me to do this? There is an RDA.jl file in the src DataFrames directory, but I did not mention this in the DataFrames documentation.
The function you are looking for is read_rda, which comes with the DataFrames package. So,
read_rda(filename)
should work and return a dict with variable names => data.