A set of predicates and assertions for checking the types of variables. Most of the documentation is on the assertive page. End-users will usually want to use assertive directly.

To install the stable version, type:

install.packages("assertive.types")

To install the development version, you first need the devtools package.

install.packages("devtools")

Then you can install the assertive.types package using

library(devtools)
install_bitbucket("richierocks/assertive.types")

All the predicates in this package check for objects of specific types.

Wrappers to functions in base:

is_array, is_call, is_character, is_complex, is_data.frame, is_environment, is_expression, is_factor, is_function, is_integer, is_language, is_list, is_logical, is_matrix, is_name/is_symbol, is_numeric, is_ordered, is_primitive, is_qr, is_raw, is_s4, and is_table.

Wrappers to functions in grDevices:

is_raster.

Wrappers to functions in methods:

is_class.

Wrappers to functions in stats:

is_leaf, is_mts, is_stepfun, is_ts, is_tskernel.

Wrappers to functions in utils:

is_relistable.

Predicates that return a vector have two corresponding assertions. For example, is_class has assert_all_are_classes and assert_any_are_classes.

Predicates returning a single logical value have one corresponding assertion. For example, is_array has assert_is_array.