How to add a named vector as a row to a data frame, reordered according to column name order?

Question

How to add a named vector to a data frame, with the components of the vector reordered according to the column names of the data frame?

I need to build a data frame

Answer 1

You could reorder the vector

rbind(df, v2[names(df)])
  id va vb vc
1  1 11 21 31
2  2 12 22 32
3  9 19 NA 34


library(microbenchmark)
microbenchmark(rbind(df, v2[names(df)]),
               rbind(df, as.data.frame(t(v2))), times = 10000)
Unit: microseconds
                            expr     min      lq  median      uq      max neval
        rbind(df, v2[names(df)]) 212.773 219.305 222.572 294.895 15300.96 10000
 rbind(df, as.data.frame(t(v2))) 374.219 382.618 387.750 516.067 39951.31 10000