Test if the object is a data frame (data.frame, data.table or tibble)

Test if the object is a data frame (data.frame, data.table or tibble)

Usage

is_dtx(x, strict = TRUE)

is_dtf(x, strict = TRUE)

is_dtt(x, strict = TRUE)

is_dtbl(x, strict = TRUE)

Arguments

x

An object

strict

Should this be strictly the corresponding class TRUE, by default, or could it be subclassed too (FALSE). With strict = TRUE, the grouped_df tibbles and grouped_ts tsibbles are also considered (tibbles or tsibbles where dplyr::group_by() was applied).

Value

These functions return TRUE if the object is of the correct class, otherwise they return FALSE. is_dtx() return TRUE if x is one of a data.frame, data.table or tibble.

Examples

# data(mtcars)
is_dtf(mtcars) # TRUE
#> [1] TRUE
is_dtx(mtcars) # Also TRUE
#> [1] TRUE
is_dtt(mtcars) # FALSE
#> [1] FALSE
is_dtbl(mtcars) # FALSE
#> [1] FALSE
# but...
is_dtt(as_dtt(mtcars)) # TRUE
#> [1] TRUE
is_dtx(as_dtt(mtcars)) # TRUE
#> [1] TRUE
is_dtbl(as_dtbl(mtcars)) # TRUE
#> [1] TRUE
is_dtx(as_dtbl(mtcars)) # TRUE
#> [1] TRUE
is_dtx(as_dtbl(mtcars) |> dplyr::group_by(cyl)) # TRUE (special case)
#> [1] TRUE

is_dtx("some string") # FALSE
#> [1] FALSE