assert_dataframe: Assert input is a data frame

In assertions: Simple Assertions for Beautiful and Customisable Error Messages

Assert input is a data frame

Description

Assert input is a data frame

Usage

assert_dataframe(x, msg = NULL, call = rlang::caller_env(), arg_name = NULL)

Arguments

x	An object
msg	A character string containing the error message to display if x is not a data frame
call	Only relevant when pooling assertions into multi-assertion helper functions. See cli_abort for details.
arg_name	Advanced use only. Name of the argument passed (default: NULL, will automatically extract arg_name).

Value

invisible(TRUE) if x is a data frame, otherwise aborts with the error message specified by msg

Examples

try({
assert_dataframe(mtcars) # Passes
assert_dataframe(data.frame()) # Passes

assert_dataframe(1:10) # Throws default error
assert_dataframe(matrix(1:6, 2, 3)) # Throws default error
assert_dataframe(c(1, 2, 3)) # Throws default error: "Error
assert_dataframe(list(a = 1, b = 2)) # Throws default error
assert_dataframe(factor(c(1, 2, 3))) # Throws default error

assert_dataframe(1:10, msg = "Custom error message") # Throws custom error
})

assertions documentation built on April 3, 2025, 5:52 p.m.