type-predicates {purrr} | R Documentation |
These type predicates aim to make type testing in R more
consistent. They are wrappers around typeof
, so
operate at a level beneath S3/S4 etc.
is_list(x) is_atomic(x) is_vector(x) is_numeric(x) is_integer(x) is_double(x) is_character(x) is_logical(x) is_null(x) is_function(x)
x |
object to be tested. |
Compare to base R functions:
Unlike is.atomic()
, is_atomic()
does not
return TRUE
for NULL
.
Unlike is.vector()
, is_vector()
test if an
object is an atomic vector or a list. is.vector
checks for the presence of attributes (other than name).
is_numeric()
is not generic so, (e.g.) dates and date times
are TRUE
, not FALSE
.
is_function()
returns TRUE
only for regular
functions, not special or primitive functions.
bare-type-predicates scalar-type-predicates