I have a dataframe that looks like this:

 `df = data.frame(V1= c(1:3), V2 = c("abc-1-10", "def-2-19", "ghi-3-937"))`

I would like to be able to add a column V3 to this dataframe such that the column V3 contains the string before the first hyphen ("-") in column V2. So it should look like this:

 `dfDesired = data.frame(V1= c(1:3), V2 = c("abc-1-10", "def-2-19", "ghi-3-937"), V3 = c("abc", "def","ghi"))`

When I try using strsplit, it gives me a list of vectors with the three parts of the each string.