These type predicates aim to make type testing in R more
consistent. They are wrappers around base::typeof()
, so operate
at a level beneath S3/S4 etc.
is_list(x, n = NULL) is_atomic(x, n = NULL) is_vector(x, n = NULL) is_integer(x, n = NULL) is_double(x, n = NULL, finite = NULL) is_character(x, n = NULL) is_logical(x, n = NULL) is_raw(x, n = NULL) is_bytes(x, n = NULL) is_null(x)
x | Object to be tested. |
---|---|
n | Expected length of a vector. |
finite | Whether all values of the vector are finite. The
non-finite values are |
Compared to base R functions:
The predicates for vectors include the n
argument for
pattern-matching on the vector length.
Unlike is.atomic()
, is_atomic()
does not return TRUE
for
NULL
.
Unlike is.vector()
, is_vector()
tests if an object is an
atomic vector or a list. is.vector
checks for the presence of
attributes (other than name).