Become an expert in R — Interactive courses, Cheat Sheets, certificates and more!
Get Started for Free
Documentation
R
rlang

scalar-type-predicates

Scalar type predicates

Description

These predicates check for a given type and whether the vector is "scalar", that is, of length 1.

In addition to the length check, is_string() and is_bool() return FALSE if their input is missing. This is useful for type-checking arguments, when your function expects a single string or a single TRUE or FALSE.

Usage

is_scalar_list(x)

is_scalar_atomic(x)

is_scalar_vector(x)

is_scalar_integer(x)

is_scalar_double(x)

is_scalar_character(x)

is_scalar_logical(x)

is_scalar_raw(x)

is_string(x, string = NULL)

is_scalar_bytes(x)

is_bool(x)

Arguments

x

object to be tested.
string

A string to compare to x. If a character vector, returns TRUE if at least one element is equal to x.

See Also

rlang

Functions for Base Types and Core R and 'Tidyverse' Features

v0.4.11
MIT + file LICENSE
Authors
Lionel Henry [aut, cre], Hadley Wickham [aut], mikefc [cph] (Hash implementation based on Mike's xxhashlite), Yann Collet [cph] (Author of the embedded xxHash library), RStudio [cph]
Initial release

We don't support your browser anymore

Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.