How debug `map()` calls that aren't working

[jennybc]

Question raised in connection to this example:

What if data frame includes variables that should not be passed to .f()?

df_oops <- tibble(
  n = 1:3,
  min = c(0, 10, 100),
  max = c(1, 100, 1000),
  oops = c("please", "ignore", "me")
)
df_oops
#> # A tibble: 3 x 4
#>       n   min   max oops  
#>   <int> <dbl> <dbl> <chr> 
#> 1     1    0.    1. please
#> 2     2   10.  100. ignore
#> 3     3  100. 1000. me

This will not work!

set.seed(123)
pmap(df_oops, runif)
#> Error in .f(n = .l[[c(1L, i)]], min = .l[[c(2L, i)]], max = .l[[c(3L, : unused argument (oops = .l[[c(4, i)]])

Use that to motivate some development and debugging strategies.

[jennybc]

I'm actively seeking good examples to use for showing how to develop / debug these workflows, so share if you'd like to nominate one!