R: Flatten a list of lists into a simple vector

flatten {purrr}

R Documentation

Flatten a list of lists into a simple vector

Description

These functions were superseded in purrr 1.0.0 because their behaviour was inconsistent. Superseded functions will not go away, but will only receive critical bug fixes.

flatten() has been superseded by list_flatten().
flatten_lgl(), flatten_int(), flatten_dbl(), and flatten_chr() have been superseded by list_c().
flatten_dfr() and flatten_dfc() have been superseded by list_rbind() and list_cbind() respectively.

Usage

flatten(.x)

flatten_lgl(.x)

flatten_int(.x)

flatten_dbl(.x)

flatten_chr(.x)

flatten_dfr(.x, .id = NULL)

flatten_dfc(.x)

Arguments

.x

A list to flatten. The contents of the list can be anything for flatten() (as a list is returned), but the contents must match the type for the other functions.

Value

flatten() returns a list, flatten_lgl() a logical vector, flatten_int() an integer vector, flatten_dbl() a double vector, and flatten_chr() a character vector.

flatten_dfr() and flatten_dfc() return data frames created by row-binding and column-binding respectively. They require dplyr to be installed.

Examples

x <- map(1:3, \(i) sample(4))
x

# was
x |> flatten_int() |> str()
# now
x |> list_c() |> str()

x <- list(list(1, 2), list(3, 4))
# was
x |> flatten() |> str()
# now
x |> list_flatten() |> str()

[Package purrr version 1.2.1 Index]