Check if strings are column names of a data.frame — assert_colnames • chevron

Provides a clearer error message in the case of missing variable.

Usage

assert_colnames(df, x, null_ok = TRUE)

Arguments

df: (data.frame) input to check for the presence of column names.
x: (vector of character) the names of the columns to be checked.
null_ok: (logical) can x be NULL.

Examples

if (FALSE) {
assert_colnames(mtcars, c("speed", "seats"), null_ok = TRUE)

my_colnames <- NULL
assert_colnames(mtcars, my_colnames, null_ok = FALSE)
}