Does the input have elements?

Does the input have elements?

hasElements(x, n = NULL, .xname = getNameInParent(x))

nElements(x)

Arguments

x	Object.
n	integer(1). Number to include.
.xname	Name of object defined in x. Not intended to be used directly.

Value

TRUE on success; FALSE on failure, with cause set.

Functions

• nElements: Return the number of elements in object.

Note

Updated 2019-10-04.

See also

• prod(), which returns the product of all values in its arguments. This is called internally to check the number of elements.

• assertive.properties::has_elements().

• assertive.properties::is_of_dimension().

• assertive.properties:::n_elements().

Examples

## TRUE ====
hasElements("hello")
#> [1] TRUE
hasElements("hello", n = 1)
#> [1] TRUE
hasElements(list(a = 1, b = 2), n = 2)
#> [1] TRUE

## FALSE ====
hasElements(NULL)
#> [1] FALSE
#> Cause: 'NULL' has 0 elements.
hasElements(list(), n = 1)
#> [1] FALSE
#> Cause: 'list()' has 0 elements, not 1.