Validate if the provided object is empty

Usage

isEmpty(object)

validateIsNotEmpty(object)

Arguments

object: An object or an atomic vector or a list of objects.

Value

isEmpty() returns TRUE if the object is empty; FALSE otherwise.
validateIsNotEmpty() returns NULL if validation is successful. Otherwise, error is signaled.

Examples

# empty list or data.frame
isEmpty(NULL)
#> [1] TRUE
isEmpty(numeric())
#> [1] TRUE
isEmpty(list())
#> [1] TRUE
isEmpty(data.frame())
#> [1] TRUE

# accounts for filtering of arrays and data.frame
df <- data.frame(x = c(1, 2, 3), y = c(4, 5, 6))
isEmpty(df)
#> [1] FALSE
isEmpty(df$x[FALSE])
#> [1] TRUE
isEmpty(df[FALSE, ])
#> [1] TRUE

# validation helper
validateIsNotEmpty(list(1, 2)) # NULL
#> NULL
# validateIsNotEmpty(NULL) # error