Append dataframe to start of a list

Question

I have 1 list A containing 2 vectors and 1 vector B. I want to insert B into A such that B is in the first position.

I have this:

A <- list(LETTERS, letters)
B <- 1:10

I want this:

A <- list(B, A[[1]], A[[2]])

I currently do this:

B <- list(B)    
for (i in 1:length(A)) {
    B[i+1] <- A[[i]]}

Is there a better way without using for loops?

Answer 1

You can simply use c :

c(list(B), A)