iff: Apply a function depending on test output

In arpr: Advanced R Pipes

Description

iff returns output of the function if and only if test is TRUE. iffn returns output of the function if and only if test is FALSE. They return the original value otherwise. iffelse returns output of the first function if test is TRUE, output of the second function otherwise.

Usage

iff(obj, test, fun, ...)

iffn(obj, test, fun, ...)

iffelse(obj, test, true_fun, false_fun, ...)

Arguments

obj	object to apply test and fun to
test	logical or function to apply to test
fun	function to apply
...	passed on to test
true_fun	function to apply when test is true
false_fun	function to apply when test is false

Value

Output of function fun applied to the original value or the original value, depending on the test.

Examples

x <- 1
x %>%
  iff(is.na, const(0))
x <- NA
x %>%
  iff(is.na, const(0))

x <- 1
x %>%
  iff(x <= 0, function(x) { x - 2 })
x <- -1
x %>%
  iff(x <= 0, function(x) { x - 2 })

x <- NA
x %>%
  iffn(is.na, exp)
x <- 10
x %>%
  iffn(is.na, exp)

arpr documentation built on Aug. 2, 2021, 5:08 p.m.