possibly()

Intermediate Functional Programming with purrr

Colin Fay

Data Scientist & R Hacker at ThinkR

O funkci possibly()

possibly() vytvoří funkci, která vrátí buď:

library(purrr)
possible_sum <- possibly(sum, otherwise = "nop")
possible_sum(1)

possible_sum("a")

0

"nop"

possibly() může vrátit:

ps <- possibly(sum, FALSE)
ps("a")

FALSE

ps <- possibly(sum, NA)
ps("a")

NA

ps <- possibly(sum, "nope")
ps("a")

"nope"

ps <- possibly(sum, 0)
ps("a")

Intermediate Functional Programming with purrr