Lists

unlist(list(list(1, 2), list(3, list(4:8)), 9))

## [1] 1 2 3 4 5 6 7 8 9

# coerces output to most general data type
unlist(list(list(1, 2), list(3, list(4:8)), "spam"))

## [1] "1"    "2"    "3"    "4"    "5"    "6"    "7"    "8"    "spam"