Use option object about furrr HOT 2 CLOSED

future_map(.x, .f, ..., .progress = FALSE, .options = future_options())

library(furrr)
#> Loading required package: future

# If you use multicore (on Mac) you can actually still access variables even though you 
# don't explicitly pass them with `globals`. This has something to do with it being a forked process.
plan(multisession)

#### Selective exporting of variables

# Export only x
x <- 1
y <- 1

future_map(1, ~x) # black magic
#> [[1]]
#> [1] 1

future_map(1, ~x, .options = future_options(globals = "y")) # no magic
#> Error in ...future.f(...future.x_jj, ...): object 'x' not found

future_map(1, ~x, .options = future_options(globals = "x")) # no magic
#> [[1]]
#> [1] 1

#### Selective exporting of packages

future_map(1, ~tibble(x = 1), .options = future_options(packages = "tibble")) # no magic
#> [[1]]
#> # A tibble: 1 x 1
#>       x
#>   <dbl>
#> 1     1

library(tibble)
future_map(1, ~tibble(x = 1)) # magic
#> [[1]]
#> # A tibble: 1 x 1
#>       x
#>   <dbl>
#> 1     1