Programación funcional intermedia con purrr
Colin Fay
Data Scientist & R Hacker at ThinkR
`possibly() crea una función que devuelve:
el resultado
el valor de otherwise
otherwise
library(purrr) possible_sum <- possibly(sum, otherwise = "nop") possible_sum(1) possible_sum("a")
library(purrr) possible_sum <- possibly(sum, otherwise = "nop") possible_sum(1)
possible_sum("a")
0 "nop"
0
"nop"
possibly() puede devolver:
possibly()
ps <- possibly(sum, FALSE) ps("a")
FALSE
NA
ps <- possibly(sum, NA) ps("a")
ps <- possibly(sum, "nope") ps("a")
"nope"
ps <- possibly(sum, 0) ps("a")
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