passing named list to cols_only() [closed]

Answer 1

Sure, just use do.call to use the list as the parameters for the function, e.g.

library(readr)

read_csv(system.file('extdata', 'mtcars.csv', package = 'readr'),    # sample data from readr
         col_types = do.call(cols_only, list(cyl = 'i')))

#> # A tibble: 32 × 1
#>      cyl
#>    
#> 1      6
#> 2      6
#> 3      4
#> 4      6
#> 5      8
#> 6      6
#> 7      8
#> 8      4
#> 9      4
#> 10     6
#> # ... with 22 more rows