arpr (version 0.1.2)

iff: Apply a function depending on test output

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

# NOT RUN {
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)

# }