The asif package provides a set of novelty functions aimed at making nested logic a little more readable than abusing ifelse. Note that the parentheses around the logical tests are required.
result_new <- mtcars %if%
(mpg > 30) %then% 30 %elif%
(mpg > 25) %then% 25 %elif%
(mpg > 20) %then% 20 %elif%
(mpg > 15) %then% 15 %else% 0Compare this to base R where the nested parentheses can get out of hand pretty quickly.
result_old <- with(mtcars,
ifelse(mpg > 30, 30,
ifelse(mpg > 25, 25,
ifelse(mpg > 20, 20,
ifelse(mpg > 15, 15, 0)))))
## results are the same
table(result_old, result_new)## result_new
## result_old 0 15 20 25 30
## 0 6 0 0 0 0
## 15 0 12 0 0 0
## 20 0 0 8 0 0
## 25 0 0 0 2 0
## 30 0 0 0 0 4