list-combine.md
In purrr: Functional Programming Tools

list_c() concatenates vctrs of compatible types

Code
  list_c(list("a", 1))
Condition
  Error in `list_c()`:
  ! Can't combine `x[[1]]` <character> and `x[[2]]` <double>.

list_c() can enforce ptype

Code
  list_c(list("a"), ptype = integer())
Condition
  Error in `list_c()`:
  ! Can't convert `x[[1]]` <character> to <integer>.

list_cbind() column-binds compatible data frames

Code
  list_cbind(list(df1, df3))
Condition
  Error in `list_cbind()`:
  ! Can't recycle `..1` (size 2) to match `..2` (size 3).

list_cbind() can enforce size

Code
  list_cbind(list(df1), size = 3)
Condition
  Error:
  ! Can't recycle input of size 2 to size 3.

list_rbind() row-binds compatible data.frames

Code
  list_rbind(list(df1, df3))
Condition
  Error in `list_rbind()`:
  ! Can't combine `..1$x` <double> and `..2$x` <character>.

list_rbind() can enforce ptype

Code
  ptype <- data.frame(x = character(), stringsAsFactors = FALSE)
  list_rbind(list(df1), ptype = ptype)
Condition
  Error in `list_rbind()`:
  ! Can't convert `..1$x` <double> to match type of `x` <character>.

assert input is a list

Code
  list_c(1)
Condition
  Error in `list_c()`:
  ! `x` must be a list, not the number 1.
Code
  list_rbind(1)
Condition
  Error in `list_rbind()`:
  ! `x` must be a list, not the number 1.
Code
  list_cbind(1)
Condition
  Error in `list_cbind()`:
  ! `x` must be a list, not the number 1.

Code
  list_c(mtcars)
Condition
  Error in `list_c()`:
  ! `x` must be a list, not a <data.frame> object.
Code
  list_rbind(mtcars)
Condition
  Error in `list_rbind()`:
  ! `x` must be a list, not a <data.frame> object.
Code
  list_cbind(mtcars)
Condition
  Error in `list_cbind()`:
  ! `x` must be a list, not a <data.frame> object.

assert input is list of data frames

Code
  list_rbind(list(1, mtcars, 3))
Condition
  Error in `list_rbind()`:
  ! Each element of `x` must be either a data frame or `NULL`.
  i Elements 1 and 3 are not.
Code
  list_cbind(list(1, mtcars, 3))
Condition
  Error in `list_cbind()`:
  ! Each element of `x` must be either a data frame or `NULL`.
  i Elements 1 and 3 are not.