Tests equality of list elements class

Compares equality of all members of a list.

Usage

listOf(x, class, valid = TRUE)

Arguments

x

A list.

class

A character defining the expected class.

valid

A logical defining if all elements should be tested for validity. Default is TRUE.

Value

TRUE is all elements of x inherit from class.

Author

Laurent Gatto

Examples

listOf(list(), "foo")
#> [1] TRUE
listOf(list("a", "b"), "character")
#> [1] TRUE
listOf(list("a", 1), "character")
#> [1] FALSE