Extract the first, last, or nth value from a vector

Extract the first, last, or nth value from a vector.

Note: These are simple wrappers around vctrs::vec_slice().

first(x, default = NULL, na_rm = FALSE)

last(x, default = NULL, na_rm = FALSE)

nth(x, n, default = NULL, na_rm = FALSE)

Arguments

x

A vector

default

The default value if the value doesn't exist.

na_rm

If TRUE ignores missing values.

n

For nth(), a number specifying the position to grab.

Examples

vec <- letters

first(vec)
#> [1] "a"
last(vec)
#> [1] "z"
nth(vec, 4)
#> [1] "d"