One thing I do not like R is that operations on String in R are not as convenient as in other programming langauges such as Java, Python and Ruby. In these 3 programming languages, you can simply use + to concatenate strings while in R you have to use the function paste. The inconvenience result from unable to overload functions and operators in R. However, you can still define/override operators in R. For example, the following code renew the definition of + to concatenate two strings.

"+" = function(x,y){
    paste(x,y,sep="")
}