checkChoice: Check if an object is an element of a given set
In checkmate: Fast and Versatile Argument Checks

checkChoice

R Documentation

Check if an object is an element of a given set

Description

Check if an object is an element of a given set

Usage

checkChoice(x, choices, null.ok = FALSE, fmatch = FALSE)

check_choice(x, choices, null.ok = FALSE, fmatch = FALSE)

assertChoice(
  x,
  choices,
  null.ok = FALSE,
  fmatch = FALSE,
  .var.name = vname(x),
  add = NULL
)

assert_choice(
  x,
  choices,
  null.ok = FALSE,
  fmatch = FALSE,
  .var.name = vname(x),
  add = NULL
)

testChoice(x, choices, null.ok = FALSE, fmatch = FALSE)

test_choice(x, choices, null.ok = FALSE, fmatch = FALSE)

expect_choice(
  x,
  choices,
  null.ok = FALSE,
  fmatch = FALSE,
  info = NULL,
  label = vname(x)
)

Arguments

`x`	[any] Object to check.
`choices`	[`atomic`] Set of possible values.
`null.ok`	[`logical(1)`] If set to `TRUE`, `x` may also be `NULL`. In this case only a type check of `x` is performed, all additional checks are disabled.
`fmatch`	[`logical(1)`] Use the set operations implemented in `fmatch` in package fastmatch. If fastmatch is not installed, this silently falls back to `match`. `fmatch` modifies `y` by reference: A hash table is added as attribute which is used in subsequent calls.
`.var.name`	[`character(1)`] Name of the checked object to print in assertions. Defaults to the heuristic implemented in `vname`.
`add`	[`AssertCollection`] Collection to store assertion messages. See `AssertCollection`.
`info`	[`character(1)`] Extra information to be included in the message for the testthat reporter. See `expect_that`.
`label`	[`character(1)`] Name of the checked object to print in messages. Defaults to the heuristic implemented in `vname`.

Value

Depending on the function prefix: If the check is successful, the functions assertChoice/assert_choice return x invisibly, whereas checkChoice/check_choice and testChoice/test_choice return TRUE. If the check is not successful, assertChoice/assert_choice throws an error message, testChoice/test_choice returns FALSE, and checkChoice/check_choice return a string with the error message. The function expect_choice always returns an expectation.

Note

The object x must be of the same type as the set w.r.t. typeof. Integers and doubles are both treated as numeric.

Examples

testChoice("x", letters)

# x is not converted before the comparison (except for numerics)
testChoice(factor("a"), "a")
testChoice(1, "1")
testChoice(1, as.integer(1))

checkmate documentation built on Sept. 11, 2024, 8:40 p.m.