Combine list elements into a single data structure

list_c() combines elements into a vector by concatenating them together with vctrs::vec_c().
list_rbind() combines elements into a data frame by row-binding them together with vctrs::vec_rbind().
list_cbind() combines elements into a data frame by column-binding them together with vctrs::vec_cbind().

Usage

list_c(x, ..., ptype = NULL)

list_cbind(
  x,
  ...,
  name_repair = c("unique", "universal", "check_unique"),
  size = NULL
)

list_rbind(x, ..., names_to = rlang::zap(), ptype = NULL)

Arguments

x: A list. For list_rbind() and list_cbind() the list must only contain only data frames or NULL.
...: These dots are for future extensions and must be empty.
ptype: An optional prototype to ensure that the output type is always the same.
name_repair: One of "unique", "universal", or "check_unique". See vctrs::vec_as_names() for the meaning of these options.
size: An optional integer size to ensure that every input has the same size (i.e. number of rows).
names_to: By default, names(x) are lost. To keep them, supply a string to names_to and the names will be saved into a column with that name. If names_to is supplied and x is not named, the position of the elements will be used instead of the names.

Examples

x1 <- list(a = 1, b = 2, c = 3)
list_c(x1)
#> [1] 1 2 3

x2 <- list(
  a = data.frame(x = 1:2),
  b = data.frame(y = "a")
)
list_rbind(x2)
#>    x    y
#> 1  1 <NA>
#> 2  2 <NA>
#> 3 NA    a
list_rbind(x2, names_to = "id")
#>   id  x    y
#> 1  a  1 <NA>
#> 2  a  2 <NA>
#> 3  b NA    a
list_rbind(unname(x2), names_to = "id")
#>   id  x    y
#> 1  1  1 <NA>
#> 2  1  2 <NA>
#> 3  2 NA    a

list_cbind(x2)
#>   x y
#> 1 1 a
#> 2 2 a