Package 'checkr'

Title: Check the Properties of Common R Objects
Description: Expressive, assertive, pipe-friendly functions to check the properties of common R objects. In the case of failure the functions issue informative error messages. Superseded by the 'chk' package.
Authors: Joe Thorley [aut, cre] , Evan Amies-Galonski [ctb] (-3188), Poisson Consulting [cph, fnd]
Maintainer: Joe Thorley <[email protected]>
License: MIT + file LICENSE
Version: 0.5.0.9001
Built: 2024-11-01 16:19:09 UTC
Source: https://github.com/poissonconsulting/checkr

Help Index

Check Attributes

Description

Checks an objects attributes.

Usage

check_attributes(
  x,
  values = NULL,
  exclusive = FALSE,
  order = FALSE,
  names = TRUE,
  class = TRUE,
  x_name = substitute(x),
  error = TRUE
)

Arguments

x

The object to check.
values

NULL (default) or a character vector specifying the column names or a named list specifying the column names and values.
exclusive

A flag indicating whether other elements are not permitted.
order

A flag indicating whether the elements have to occur in the same order as values.
names

A flag specifying whether names should be considered an attribute.
class

A flag specifying whether class should be considered an attribute.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_list()

Examples

x <- 1
attributes(x) <- list(y = 2L)
check_attributes(x, values = list(y = 3:4), error = FALSE)

Check Character

Description

Checks if x is a character vector with no attributes including names.

Usage

check_character(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
coerce

A flag indicating whether to coerce a factor to a character vector and drop attributes including names.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_int()

Examples

check_character("1", error = FALSE)
check_character(1:2, error = FALSE)

Check String

Description

Checks if object is a string (non-missing character scalar with no attributes including names).

Usage

check_chr(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

check_string(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
coerce

A flag indicating whether to coerce a factor scalar to a string and drop attributes including names.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_scalar()

Examples

check_chr(1, error = FALSE)
check_chr("1", error = FALSE)
check_chr(c("1", "2"), error = FALSE)

Check Classes

Description

Checks that an object inherits from one or more classes.

Usage

check_classes(
  x,
  classes = character(0),
  exclusive = FALSE,
  order = FALSE,
  x_name = substitute(x),
  error = TRUE
)

Arguments

x

The object to check.
classes

A character vector of the classes x should inherit from.
exclusive

A flag indicating whether other classes are not permitted.
order

A flag indicating whether the object classes have to occur in the same order as classes.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Details

The classes of an object can be returned using the class() function.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_inherits()

Examples

check_classes(list())
check_classes(list(), "list")
check_classes(list(), "numeric", error = FALSE)

Check Colnames

Description

Checks the column names of a data frame as returned by the colnames() function. The function can check the order of the columns and whether other columns are permitted.

Usage

check_colnames(
  x,
  colnames = character(0),
  exclusive = FALSE,
  order = FALSE,
  x_name = substitute(x),
  error = TRUE
)

Arguments

x

The data to check.
colnames

A character vector of the column names.
exclusive

A flag indicating whether other columns are not permitted.
order

A flag indicating whether the columns have to occur in the same order as colnames.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_missing_colnames() and check_data()

Examples

data <- data.frame(x = 1, y = 2, z = 0)
check_colnames(data, c("y", "x"), error = FALSE)
check_colnames(data, c("y", "x"), exclusive = TRUE, error = FALSE)
check_colnames(data, c("y", "x"), order = TRUE, error = FALSE)
check_colnames(data, c("a"), error = FALSE)

Check Count

Description

Checks if an object is a count (non-negative integer or if coerce = TRUE non-negative numeric whole number).

Usage

check_count(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
coerce

A flag indicating whether to coerce a non-negative numeric (dbl) whole number to a count and drop attributes (including names).
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_scalar()

Examples

check_count(-1L, error = FALSE)
check_count(1L, error = FALSE)
check_count(1, error = FALSE)
check_count(1, coerce = TRUE, error = FALSE)
check_count(1.01, coerce = TRUE, error = FALSE)

Check Data

Description

Checks whether an object is a data frame. Can also check the number of rows, the names and order and values of the columns as well as whether particular columns form a unique key.

Usage

check_data(
  x,
  values = NULL,
  nrow = NA,
  exclusive = FALSE,
  order = FALSE,
  key = character(0),
  x_name = substitute(x),
  error = TRUE
)

Arguments

x

The object to check.
values

NULL (default) or a character vector specifying the column names or a named list specifying the column names and values.
nrow

A flag indicating whether x should have rows (versus no rows) or a missing value indicating no requirements or a count or count range of the number of rows.

@return An invisible copy of x (if it doesn't throw an error).
exclusive

A flag indicating whether other columns are not permitted.
order

A flag indicating whether the columns have to occur in the same order as values.
key

A character vector of the columns that represent a unique key.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_colnames(), check_nrow() and check_key()

Examples

z <- data.frame(
 Count = c(0L, 3L, 3L, 0L, NA), 
  Longitude = c(0, 0, 90, 90, 180), 
  Latitude = c(0, 90, 90.2, 100, -180),
  Type = factor(c("Good", "Bad", "Bad", "Bad", "Bad"), levels = c("Good", "Bad")),
  Extra = TRUE,
  Comments = c("In Greenwich", "Somewhere else", "I'm lost", 
    "I didn't see any", "Help"), 
  stringsAsFactors = FALSE)

check_data(z, values = list(
  Count = 1,
  Extra = NA,
  Latitude = c(45, 90)
  ), exclusive = TRUE, order = TRUE, nrow = 10L, key = "Longitude", error = FALSE)

Check Date

Description

Checks if x is a date (non-missing unnamed Date scalar).

Usage

check_date(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

check_day(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
coerce

A flag indicating whether to coerce a date time (POSIXt scalar) to a Date and remove names.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_datetime()

Examples

check_date(Sys.Date(), error = FALSE)
check_date(Sys.time(), error = FALSE)
check_date(Sys.time(), coerce = TRUE, error = FALSE)

Check Dbl

Description

Checks if x is a dbl (non-missing numeric scalar with no attributes including names).

Usage

check_dbl(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

check_number(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
coerce

A flag indicating whether to coerce a scalar integer to a dbl and drop attributes including names.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_scalar()

Examples

check_dbl(1, error = FALSE)
check_dbl(1L, error = FALSE)
check_dbl(c(1,2), error = FALSE)

Check Date Time

Description

Checks if x is a datetime (non-missing unnamed POSIXct scalar).

Usage

check_dttm(
  x,
  coerce = FALSE,
  tzone = "UTC",
  x_name = substitute(x),
  error = TRUE
)

check_datetime(
  x,
  coerce = FALSE,
  tzone = "",
  x_name = substitute(x),
  error = TRUE
)

Arguments

x

The object to check.
coerce

A flag indicating whether to coerce a date to a dttm (using the time zone tzone) and remove names.
tzone

A string of the time zone where "" is the current time zone.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_scalar()

Examples

check_dttm(Sys.Date(), error = FALSE)
check_dttm(Sys.time(), error = FALSE)

Check Environment

Description

Checks if x is an environment.

Usage

check_environment(x, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

Examples

check_environment(1, error = FALSE)
check_environment(.GlobalEnv, error = FALSE)

Check Flag or NA

Description

Checks if x is a flag or NA (missing logical scalar).

Usage

check_flag_na(x, coerce = TRUE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
coerce

A flag indicating whether to drop attributes including names.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Details

Useful when using flag to pass one of three options.

Value

An invisible copy of x (if it doesn't throw an error).

Check Function

Description

Checks if x is a function.

Usage

check_function(x, nargs = NA, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
nargs

A count of the number of arguments or count range of the minimum and maximum number of arguments.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

Examples

check_function(character, error = FALSE)
check_function(character, nargs = 0L, error = FALSE)

Check Matches Regular Expression

Description

Checks whether all the elements of an object match a regular expression.

Usage

check_grepl(
  x,
  pattern = ".*",
  regex = pattern,
  x_name = substitute(x),
  error = TRUE
)

check_regex(x, regex = ".*", x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
pattern

A string of the regular expression.
regex

A string of the regular expression (deprecated for pattern).
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_nchar() and check_pattern()

Examples

check_grepl("foo", "fo")
check_grepl("foo", "fo$", error = FALSE)

Check Homogenous

Description

Checks whether the elements of x are all of the same class. It works on vectors, matrices and arrays which, by definition will always be homogenous and lists and data frames which may or may not be homogenous.

Usage

check_homogenous(
  x,
  strict = FALSE,
  recursive = FALSE,
  x_name = substitute(x),
  error = TRUE
)

Arguments

x

The object to check.
strict

A flag indicating whether all the objects must have identical classes or just share one or more classes.
recursive

A flag indicating whether the check should be applied recursively.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_vector(), check_list() and check_data()

Examples

check_homogenous(1:2)
check_homogenous(list(1,2))
check_homogenous(list(1,TRUE), error = FALSE)

Check Inherits

Description

Checks if an object inherits from a class.

Usage

check_inherits(x, class, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
class

A string of the class x should inherit from.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_classes()

Examples

check_inherits(list(), "list")
check_inherits(list(), "numeric", error = FALSE)

Check Int

Description

Checks if x is a int (non-missing integer scalar with no attributes including names).

Usage

check_int(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
coerce

A flag indicating whether to coerce a numeric (dbl) whole number to an int and drop attributes including names.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_scalar()

Examples

check_int(1, error = FALSE)
check_int(1L, error = FALSE)
check_int(1:2, error = FALSE)

Check Integer

Description

Checks if x is an integer vector with no attributes including names.

Usage

check_integer(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
coerce

A flag indicating whether to coerce a numeric (dbl) whole number vector to an integer vector and drop attributes including names.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_int()

Examples

check_integer(1, error = FALSE)
check_integer(1L, error = FALSE)
check_integer(1:2, error = FALSE)

Check Atomic Vector Intersection

Description

Checks that all the elements in atomic vector x intersect with those in atomic vector y.

Usage

check_intersection(
  x,
  y,
  all_y = FALSE,
  x_name = substitute(x),
  y_name = substitute(y),
  error = TRUE
)

Arguments

x

The object to check.
y

The second atomic vector.
all_y

A flag indicating whether all the elements in y should have a match in x.
x_name

A string of the name of the object x.
y_name

A string of the name of the object y.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_join()

Examples

x1 <- 1:3
x2 <- 1:4
check_intersection(x1, x2)
check_intersection(x2, x1, error = FALSE)

Check Join

Description

Checks that the columns in data frame x form a many-to-one join with the corresponding columns in y, ie, the join is a unique key in y and all the rows in x have a match in y.

Usage

check_join(
  x,
  y,
  by = NULL,
  all_y = FALSE,
  x_name = substitute(x),
  y_name = substitute(y),
  error = TRUE
)

Arguments

x

The object to check.
y

The parent data frame.
by

A character vector or named character vector of the columns to join by.
all_y

A flag indicating whether all the rows in y should have a match in x.
x_name

A string of the name of the object x.
y_name

A string of the name of the object y.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_data()

Examples

data1 <- data.frame(x = 1:2)
data2 <- data.frame(x = 3:5, y = 2L)
check_join(data1, data2, error = FALSE)
check_join(data1, data2, by = c(x = "y"), error = FALSE)

Check Key

Description

Checks that columns in a data frame represent a unique key. By default all the columns are checked.

Usage

check_key(
  x,
  key = names(x),
  na_distinct = FALSE,
  x_name = substitute(x),
  error = TRUE
)

Arguments

x

The data to check.
key

A character vector of the column names representing the key.
na_distinct

A flag specifying whether missing values should be considered distinct.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_data()

Examples

data <- data.frame(x = 1:1, y = 1:2)
check_key(data, "x", error = FALSE)
check_key(data, c("y", "x"), error = FALSE)

Check Length

Description

Checks whether the number of elements in an object is an exact number, within a range or 0 vs positive.

Usage

check_length(x, length = TRUE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
length

A flag indicating whether x should have elements (versus no elements) or a missing value indicating no requirements or a count or count range of the number of elements or a count vector of the permitted number of elements.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_vector(), check_list() and check_data()

Examples

check_length(2)
check_length(character(0), length = 0)
check_length(NULL, error = FALSE)
check_length(list(), error = FALSE)

Check Length One

Description

Checks whether x is an object of length 1.

Usage

check_length1(x, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

Examples

check_length1(2)
check_length1(1:2, error = FALSE)
check_length1(NULL, error = FALSE)
check_length1(list(), error = FALSE)

Check Levels

Description

Checks the levels in a factor including the order and whether other levels are permitted.

Usage

check_levels(
  x,
  levels,
  exclusive = TRUE,
  order = TRUE,
  x_name = substitute(x),
  error = TRUE
)

Arguments

x

The object to check.
levels

A character vector of the levels.
exclusive

A flag indicating whether other levels are not permitted.
order

A flag indicating whether the object levels have to occur in the same order as names. To check whether x is an ordered factor use check_vector(x, ordered(1)).
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_nlevels() and check_vector()

Examples

check_levels(1, c("x", "y"), error = FALSE)
check_levels(factor(1), c("x", "y"), error = FALSE)

Check Flag

Description

Checks if x is a flag (non-missing logical scalar with no attributes including names).

Usage

check_lgl(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

check_flag(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
coerce

A flag indicating whether to drop attributes including names.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_scalar()

Examples

check_lgl(1, error = FALSE)
check_lgl(FALSE, error = FALSE)
check_lgl(c(FALSE, TRUE), error = FALSE)

Check List

Description

Checks whether an object is a list and optionally the names and values of its elements.

Usage

check_list(
  x,
  values = NULL,
  length = NA,
  unique = FALSE,
  named = NA,
  exclusive = FALSE,
  order = FALSE,
  x_name = substitute(x),
  error = TRUE
)

Arguments

x

The object to check.
values

NULL (default) or a character vector specifying the column names or a named list specifying the column names and values.
length

A flag indicating whether x should have elements (versus no elements) or a missing value indicating no requirements or a count or count range of the number of elements or a count vector of the permitted number of elements.
unique

A flag indicating whether the values must be unique.
named

A flag indicating whether the list must be named or unnamed or a regular expression that must match all the names or count or count range of the number of characters in the names or NA if it doesn't matter if the list is named.
exclusive

A flag indicating whether other elements are not permitted.
order

A flag indicating whether the elements have to occur in the same order as values.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_length() and check_unique()

Examples

check_list(list())
check_list(list(x1 = 2, x2 = 1:2), values = list(x1 = 1, x2 = 1L))

Check Logical

Description

Checks if x is a logical vector with no attributes including names.

Usage

check_logical(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
coerce

A flag indicating whether to drop attributes including names.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_scalar()

Examples

check_logical(1, error = FALSE)
check_logical(FALSE, error = FALSE)
check_logical(c(FALSE, TRUE), error = FALSE)

Check Missing Colnames

Description

Checks whether specific colnames are missing from a data frame.

Usage

check_missing_colnames(x, colnames, x_name = substitute(x), error = TRUE)

Arguments

x

The data to check.
colnames

A character vector of the column names that must be missing from x.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_colnames() and check_data()

Examples

data <- data.frame(x = 1, y = 2, z = 0)
check_missing_colnames(data, c("y", "x", "a"), error = FALSE)
check_missing_colnames(data, "a", error = FALSE)

Check Missing Names

Description

Checks whether specific names are missing from an object.

Usage

check_missing_names(x, names, x_name = substitute(x), error = TRUE)

Arguments

x

The named object to check.
names

A character vector of the names that must be missing from x.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_names()

Examples

vec <- c(x = 1, y = 2, z = 0)
check_missing_names(vec, c("y", "x", "a"), error = FALSE)
check_missing_names(vec, "a", error = FALSE)

Check Name

Description

Checks whether each element of a character vector is a syntactically valid name.

Usage

check_name(x, x_name = substitute(x), coerce = FALSE, error = TRUE)

Arguments

x

The object to check.
x_name

A string of the name of the object x.
coerce

A flag specifying whether to coerce a factor to a character vector and drop attributes including names.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_character()

Examples

vec <- c("x", "x.y", "x y")
check_name(vec, error = FALSE)

Check Named

Description

Checks whether an object is named.

Usage

check_named(
  x,
  nchar = c(0L, chk_max_int()),
  pattern = ".*",
  regex = pattern,
  unique = FALSE,
  x_name = substitute(x),
  error = TRUE
)

Arguments

x

The object to check.
nchar

A count or count range of the number of characters.
pattern

A string of the regular expression that must match all names.
regex

A string of the regular expression that must match all names.
unique

A flag indicating whether the names must be unique.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_unnamed(), check_names() and check_missing_names()

Examples

check_named(2, error = FALSE)
x <- 1
names(x) <- "y"
check_named(x, error = FALSE)

Check Names

Description

Checks the names of an object as returned by the names() function. The function can check the order of the names and whether other names are permitted.

Usage

check_names(
  x,
  names = character(0),
  exclusive = FALSE,
  order = FALSE,
  unique = FALSE,
  complete = TRUE,
  x_name = substitute(x),
  error = TRUE
)

Arguments

x

The object to check.
names

A character vector of the names.
exclusive

A flag indicating whether other names are not permitted.
order

A flag indicating whether the object names have to occur in the same order as names.
unique

A flag indicating whether all the object names have to be unique.
complete

A flag indicating whether all the possible names have to be represented.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_named()

Examples

vec <- c(x = 1, y = 2, z = 0)
check_names(vec, c("y", "x"), error = FALSE)
check_names(vec, c("y", "x"), exclusive = TRUE, error = FALSE)
check_names(vec, c("y", "x"), order = TRUE, error = FALSE)
check_names(vec, c("a"), error = FALSE)

Check Number of Characters

Description

Checks the number of characters in the elements of an object.

Usage

check_nchar(x, nchar = TRUE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
nchar

A flag indicating whether x should have characters or a missing value indicating no requirements or a count or count range of the number of characters.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_pattern() and check_regex()

Examples

check_nchar(c("foo", "bar"), nchar = 3)

Check Number of Columns

Description

Checks the number of columns of a data frame.

Usage

check_ncol(x, ncol = TRUE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
ncol

A flag indicating whether x should have columns (versus no columns) or a missing value indicating no requirements or a count or count range of the number of columns.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_nrow() and check_data()

Examples

check_ncol(data.frame(x = 1), error = FALSE)
check_ncol(data.frame(x = 1:2), ncol = 1, error = FALSE)

Check Negative Dbl

Description

Checks if x is a negative dbl (non-missing numeric scalar with no attributes including names).

Usage

check_neg_dbl(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
coerce

A flag indicating whether to coerce a scalar integer to a dbl and drop attributes including names.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_dbl()

Examples

check_neg_dbl(1, error = FALSE)
check_neg_dbl(0L, error = FALSE)
check_neg_dbl(0, error = FALSE)

Check Negative Int

Description

Checks if x is a negative int (non-missing integer scalar with no attributes including names).

Usage

check_neg_int(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
coerce

A flag indicating whether to coerce a numeric (dbl) whole number to an int and drop attributes including names.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_int()

Examples

check_neg_int(0L, error = FALSE)
check_neg_int(-1L, error = FALSE)

Check nlevels

Description

Checks the number of levels of an object.

Usage

check_nlevels(x, nlevels = TRUE, x_name = substitute(x), error = TRUE)

Arguments

x

The data to check.
nlevels

A flag indicating whether x should have elements (versus no elements) or a missing value indicating no requirements or a count or count range of the number of elements.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_levels() and check_vector()

Examples

check_nlevels(factor(1), error = FALSE)
check_nlevels(factor(1), nlevels = 2, error = FALSE)

Check No Attributes

Description

Checks an object has no attributes.

Usage

check_no_attributes(
  x,
  names = TRUE,
  class = TRUE,
  x_name = substitute(x),
  error = TRUE
)

Arguments

x

The object to check.
names

A flag specifying whether names should be considered an attribute.
class

A flag specifying whether class should be considered an attribute.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_attributes()

Examples

x <- 1
attributes(x) <- list(y = 2L)
check_no_attributes(x, error = FALSE)

Check Non-Negative Dbl

Description

Checks if x is a non-negative dbl (non-missing numeric scalar with no attributes including names).

Usage

check_noneg_dbl(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
coerce

A flag indicating whether to coerce a scalar integer to a dbl and drop attributes including names.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_dbl()

Examples

check_noneg_dbl(1, error = FALSE)
check_noneg_dbl(0L, error = FALSE)
check_noneg_dbl(0, error = FALSE)

Check Non-Negative Int

Description

Checks if x is a count (non-missing non-negative integer scalar with no attributes including names).

Usage

check_noneg_int(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
coerce

A flag indicating whether to coerce a non-negative numeric (dbl) whole number to a count and drop attributes (including names).
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_int()

Examples

check_noneg_int(1, error = FALSE)
check_noneg_int(0L, error = FALSE)
check_noneg_int(1L, error = FALSE)

Check Number of Rows

Description

Checks the number of rows of a data frame.

Usage

check_nrow(x, nrow = TRUE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
nrow

A flag indicating whether x should have rows (versus no rows) or a missing value indicating no requirements or a count or count range of the number of rows.

@return An invisible copy of x (if it doesn't throw an error).
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

See Also

check_ncol() and check_data()

Examples

check_nrow(data.frame(x = 1), error = FALSE)
check_nrow(data.frame(x = integer(0)), error = FALSE)
check_nrow(data.frame(x = 1:2), nrow = 1, error = FALSE)

Check NULL

Description

Checks whether an object is NULL.

Usage

check_null(x, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

Examples

check_null(1, error = FALSE)
check_null(NULL, error = FALSE)

Check Numeric

Description

Checks if x is an numeric (double) vector with no attributes including names.

Usage

check_numeric(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

check_double(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
coerce

A flag indicating whether to coerce a integer vector to an double vector and drop attributes including names.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_number()

Examples

check_numeric(1, error = FALSE)
check_numeric(1L, error = FALSE)
check_numeric(1:2, error = FALSE)

Check Pattern

Description

Checks whether all or some of the elements of x match pattern using grepl().

Usage

check_pattern(x, pattern, all = TRUE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
pattern

A string of the regular expression.
all

A flag indicating whether all or some of the element must match pattern.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_nchar() and check_regex()

Check Positive Dbl

Description

Checks if x is a positive dbl (non-missing numeric scalar with no attributes including names).

Usage

check_pos_dbl(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
coerce

A flag indicating whether to coerce a scalar integer to a dbl and drop attributes including names.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_dbl()

Examples

check_pos_dbl(1, error = FALSE)
check_pos_dbl(0L, error = FALSE)
check_pos_dbl(0, error = FALSE)

Check Positive Int

Description

Checks if x is a positive int (non-missing integer scalar with no attributes including names).

Usage

check_pos_int(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
coerce

A flag indicating whether to coerce a numeric (dbl) whole number to an int and drop attributes including names.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_int()

Examples

check_pos_int(0, error = FALSE)
check_pos_int(1L, error = FALSE)
check_pos_int(1:2, error = FALSE)

Check Probability

Description

Checks if x is a probability (non-missing dbl between 0 and 1 inclusive with no attributes including names).

Usage

check_prob(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

check_probability(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

check_prop(x, coerce = FALSE, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
coerce

A flag indicating whether to coerce an integer to a dbl and drop attributes including names.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_scalar()

Examples

check_prob(1, error = FALSE)
check_prob(1.1, error = FALSE)
check_prob(c(0, 1), error = FALSE)

Check Proportions

Description

Checks if x is proportions vector - non-missing dbls between 0 and 1 that sum to 1.

Usage

check_props(x, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

Check Row Bind

Description

Checks whether a data frame has the same columns of the same classes as a second data frame which means they can be rbind()ed without a problem.

Usage

check_rbind(
  x,
  y,
  exclusive = TRUE,
  order = FALSE,
  x_name = substitute(x),
  y_name = substitute(y),
  error = TRUE
)

Arguments

x

The first data frame.
y

The second data frame.
exclusive

A flag indicating whether other columns are not permitted.
order

A flag indicating whether the columns have to occur in the same order.
x_name

A string of the name of the object x.
y_name

A string of the name of the object y.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_join()

Examples

check_rbind(datasets::mtcars, datasets::mtcars)

Check Scalar

Description

Checks whether an object is an atomic vector with one element.

Usage

check_scalar(
  x,
  values = NULL,
  named = FALSE,
  attributes = named,
  only = FALSE,
  x_name = substitute(x),
  error = TRUE
)

Arguments

x

The object to check.
values

NULL or a vector specifying the values.
named

A flag indicating whether the scalar must be named or unnamed or NA if it doesn't matter if the scalar is named.
attributes

A flag indicating whether the scalar must or must not have attributes or NA if it doesn't matter if the scalar is named.
only

A flag indicating whether only the actual values are permitted. It only affects values with two or less non-missing elements.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_vector()

Examples

check_scalar(1)
check_scalar(c(1,2), error = FALSE)
check_scalar(1, c(2,3), error = FALSE)

Check Sorted

Description

Checks whether object x is sorted using !is.unsorted(x, na.rm = TRUE).

Usage

check_sorted(x, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_vector() and check_list()

Examples

check_sorted(1:2, error = FALSE)
check_sorted(2:1, error = FALSE)

Check TimeZone

Description

Checks an objects tzone attribute.

Usage

check_tzone(x, tzone = "UTC", x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
tzone

A string of the time zone.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

Examples

check_tzone(Sys.Date(), error = FALSE)
x <- as.POSIXct("2000-01-02 03:04:55", tz = "Etc/GMT+8")
check_tzone(x, tzone = "PST8PDT", error = FALSE)

Check Unique

Description

Checks whether all elements of an object are unique.

Usage

check_unique(x, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_vector()

Examples

check_unique(2, error = FALSE)
check_unique(c(2,2), error = FALSE)
check_unique(1:2, error = FALSE)
check_unique(character(0), error = FALSE)
check_unique(NULL, error = FALSE)
check_unique(list(), error = FALSE)

Check Unnamed

Description

Checks whether an objects is unnamed.

Usage

check_unnamed(x, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

See Also

check_named(), check_names() and check_missing_names()

Examples

check_unnamed(2, error = FALSE)
x <- 1
names(x) <- "y"
check_unnamed(x, error = FALSE)

Check Unused

Description

Checks whether ... is unused. It can only be used in functions.

Usage

check_unused(..., x_name = "...", error = TRUE)

Arguments

...

The arguments to check.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

Examples

fun <- function(...) check_unused(..., error = FALSE)
fun()
fun(1)

Check Atomic Vector

Description

Check Atomic Vector

Usage

check_vector(
  x,
  values = NULL,
  length = NA,
  unique = FALSE,
  sorted = FALSE,
  named = NA,
  attributes = named,
  names = TRUE,
  class = TRUE,
  only = FALSE,
  x_name = substitute(x),
  error = TRUE
)

Arguments

x

The object to check.
values

NULL or a vector specifying the values.
length

A flag indicating whether x should have elements (versus no elements) or a missing value indicating no requirements or a count or count range of the number of elements or a count vector of the permitted number of elements.
unique

A flag indicating whether the values must be unique.
sorted

A flag indicating whether the vector must be sorted.
named

A flag indicating whether the vector must be named or unnamed or NA if it doesn't matter.
attributes

A flag indicating whether the vector must or must not have attributes or NA if it doesn't matter.
names

A flag specifying whether names should be considered an attribute.
class

A flag specifying whether class should be considered an attribute.
only

A flag indicating whether only the actual values are permitted. It only affects values with two or less non-missing elements.
x_name

A string of the name of the object x.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

Examples

check_vector(2:1, length = 3, sorted = TRUE, named = TRUE, error = FALSE)
check_vector(c("one", "two", "four"), values = c("one", "two", "two"), error = FALSE)

Check OR

Description

Checks that at least one check passes.

Usage

checkor(..., error = TRUE)

Arguments

...

The checks to check.
error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible flag indicating whether at least one check passes (if it doesn't throw an error).

Examples

checkor(check_null(NULL), check_null(1), error = FALSE)
checkor(check_null(1), check_null(1), error = FALSE)
checkor(check_null(1), check_null(2), error = FALSE)

Deparse

Description

chk_deparse is a wrapper on deparse() that sets a missing value to be "NA"

Usage

chk_deparse(x)

Arguments

x

A substituted object to deparse

Value

A string

See Also

deparse()

Examples

chk_deparse(1^2)

Fail

Description

Fail

Usage

chk_fail(..., error)

Arguments

...

The message.
error

A flag indicating whether to return an error (the default) or a warning.

Max Double

Description

Max Double

Usage

chk_max_dbl()

Value

An dbl of the maximum numeric value for the system.

Examples

chk_max_dbl()

Max Int

Description

Max Int

Usage

chk_max_int()

Value

An int of the maximum integer value for the system.

Examples

chk_max_int()

Min Double

Description

Min Double

Usage

chk_min_dbl()

Value

An dbl of the minimum numeric value for the system.

Examples

chk_min_dbl()

Min Integer

Description

Min Integer

Usage

chk_min_int()

Value

An int of the minimum integer value for the system.

Examples

chk_min_int()

Tiny Positive Double

Description

Tiny Positive Double

Usage

chk_tiny_dbl()

Value

An dbl of the tiniest positive numeric value for the system.

Examples

chk_tiny_dbl()