Please consider the snippet at the end of the post.
I would like to be able to save (possibly as an RDS) the results of the computations while they progress (e.g. every time a new 10% of the list is processed). How can I do that?

library(tidyverse)


ll <- 1:1000


res <- map(ll, (x) cos(x))



sessionInfo()
#> R version 4.4.1 (2024-06-14)
#> Platform: x86_64-pc-linux-gnu
#> Running under: Debian GNU/Linux 12 (bookworm)
#> 
#> Matrix products: default
#> BLAS:   /usr/lib/x86_64-linux-gnu/blas/libblas.so.3.11.0 
#> LAPACK: /usr/lib/x86_64-linux-gnu/lapack/liblapack.so.3.11.0
#> 
#> locale:
#>  [1] LC_CTYPE=en_GB.UTF-8       LC_NUMERIC=C              
#>  [3] LC_TIME=en_GB.UTF-8        LC_COLLATE=en_GB.UTF-8    
#>  [5] LC_MONETARY=en_GB.UTF-8    LC_MESSAGES=en_GB.UTF-8   
#>  [7] LC_PAPER=en_GB.UTF-8       LC_NAME=C                 
#>  [9] LC_ADDRESS=C               LC_TELEPHONE=C            
#> [11] LC_MEASUREMENT=en_GB.UTF-8 LC_IDENTIFICATION=C       
#> 
#> time zone: Europe/Brussels
#> tzcode source: system (glibc)
#> 
#> attached base packages:
#> [1] stats     graphics  grDevices utils     datasets  methods   base     
#> 
#> other attached packages:
#>  [1] lubridate_1.9.3 forcats_1.0.0   stringr_1.5.1   dplyr_1.1.4    
#>  [5] purrr_1.0.2     readr_2.1.5     tidyr_1.3.1     tibble_3.2.1   
#>  [9] ggplot2_3.5.1   tidyverse_2.0.0
#> 
#> loaded via a namespace (and not attached):
#>  [1] gtable_0.3.5      compiler_4.4.1    reprex_2.1.0      tidyselect_1.2.1 
#>  [5] scales_1.3.0      yaml_2.3.8        fastmap_1.1.1     R6_2.5.1         
#>  [9] generics_0.1.3    knitr_1.46        munsell_0.5.1     R.cache_0.16.0   
#> [13] tzdb_0.4.0        pillar_1.9.0      R.utils_2.12.3    rlang_1.1.3      
#> [17] utf8_1.2.4        stringi_1.8.4     xfun_0.43         fs_1.6.4         
#> [21] timechange_0.3.0  cli_3.6.2         withr_3.0.0       magrittr_2.0.3   
#> [25] digest_0.6.35     grid_4.4.1        hms_1.1.3         lifecycle_1.0.4  
#> [29] R.methodsS3_1.8.2 R.oo_1.26.0       vctrs_0.6.5       evaluate_0.23    
#> [33] glue_1.7.0        styler_1.10.3     fansi_1.0.6       colorspace_2.1-0 
#> [37] rmarkdown_2.26    tools_4.4.1       pkgconfig_2.0.3   htmltools_0.5.8.1

^{Created on 2024-06-27 with reprex v2.1.0}