Convert a list into a string

Question

I would like to convert value stored as a list into a single string.

For example:

l <- list(1,2,3,4)

would give:

"1234"

and not as using the output of unlist():

unlist(l)
#[1] "1" "2" "3" "4"

Answer 1

 paste( unlist(l), collapse='')