purrr::safely

Capturing Errors: turns errors into data!

x <- list(
  c(0.512, 0.165, 0.717),
  c(0.064, 0.781, 0.427),
  c(0.890, 0.785, 0.495),
  "oops"
)

map_dbl(x, sum)
#> Error in .Primitive("sum")(..., na.rm = na.rm): invalid 'type' (character) of
#> argument

# note use of map (not map_dbl), safely returns a lisst

out <- map(x, safely(sum))
str(transpose(out))
#> List of 2
#>  $ result:List of 4
#>   ..$ : num 1.39
#>   ..$ : num 1.27
#>   ..$ : num 2.17
#>   ..$ : NULL
#>  $ error :List of 4
#>   ..$ : NULL
#>   ..$ : NULL
#>   ..$ : NULL
#>   ..$ :List of 2
#>   .. ..$ message: chr "invalid 'type' (character) of argument"
#>   .. ..$ call   : language .Primitive("sum")(..., na.rm = na.rm)
#>   .. ..- attr(*, "class")= chr [1:3] "simpleError" "error" "condition"