Simplification maintains a one-to-one correspondence between the input
and output, implying that each element of x must contain a one element
vector or a one-row data frame. If you don't want to maintain this
correspondence, then you probably want either list_c()/list_rbind() or
list_flatten().
list_simplify(x, ..., strict = TRUE, ptype = NULL)A list.
These dots are for future extensions and must be empty.
What should happen if simplification fails? If TRUE
(the default) it will error. If FALSE and ptype is not supplied,
it will return x unchanged.
An optional prototype to ensure that the output type is always the same.
A vector the same length as x.
list_simplify(list(1, 2, 3))
#> [1] 1 2 3
# Only works when vectors are length one and have compatible types:
try(list_simplify(list(1, 2, 1:3)))
#> Error in list_simplify(list(1, 2, 1:3)) :
#> `x[[3]]` must have size 1, not size 3.
try(list_simplify(list(1, 2, "x")))
#> Error in list_simplify(list(1, 2, "x")) :
#> Can't combine `<list>[[1]]` <double> and `<list>[[3]]` <character>.
# Unless you strict = FALSE, in which case you get the input back:
list_simplify(list(1, 2, 1:3), strict = FALSE)
#> [[1]]
#> [1] 1
#>
#> [[2]]
#> [1] 2
#>
#> [[3]]
#> [1] 1 2 3
#>
list_simplify(list(1, 2, "x"), strict = FALSE)
#> [[1]]
#> [1] 1
#>
#> [[2]]
#> [1] 2
#>
#> [[3]]
#> [1] "x"
#>