Použití purrr ve vašem pracovním postupu

Foundations of Functional Programming with purrr

Auriel Fournier

Instructor

Kontrola názvů

library(repurrrsive)
data(sw_films)
names(sw_films)

NULL

str(sw_films)

List of 14
 $ title        : chr ...
 $ episode_id   : int ...
 $ opening_crawl: chr ...
 $ director     : chr ...
 ...

sw_films <- sw_films %>%
  set_names(map_chr(sw_films, 
            "title"))

names(sw_films)

[1] "A New Hope"              
[2] "Attack of the Clones"   
[3] "The Phantom Menace"      
[4] "Revenge of the Sith"    
[5] "Return of the Jedi"      
[6] "The Empire Strikes Back"
[7] "The Force Awakens"

Nastavování názvů při dotazování

map_chr(sw_films, ~.x[["episode_id"]]) %>%
  set_names(map_chr(sw_films, "title")) %>%
  sort()

  The Phantom Menace    Attack of the Clones 
                    "1"                     "2" 
    Revenge of the Sith              A New Hope 
                    "3"                     "4" 
The Empire Strikes Back      Return of the Jedi 
                    "5"                     "6" 
      The Force Awakens 
                    "7"

Pojďme si to procvičit!

Foundations of Functional Programming with purrr