type_of: Fuzzily Compare Types of Objects

Description

Type evaluation and comparison is carried out with special treatment for numerics, integers, and function types. Whole number NA-free numeric vectors of sufficiently short length (<100 by default) representable in the integer type are considered to be type integer. Closures, built-ins, and specials are all treated as type closure.

Usage

type_of(object)
type_alike(target, current, settings = NULL)

Value

For type_of character(1L) the type of the object, for type_alike

either TRUE, or a string describing why the types are not alike.

Arguments

object: the object to check the type of
target: the object to test type alikeness against
current: the object to test the type alikeness of
settings: NULL, or a list as produced by vetr_settings()

Details

Specific behavior can be tuned with the type.mode parameter to the vetr_settings() object passed as the settings parameter to this function.

Examples

Run this code

type_of(1.0001)          # numeric
type_of(1.0)             # integer (`typeof` returns numeric)
type_of(1)               # integer (`typeof` returns numeric)
type_of(sum)             # closure (`typeof` returns builtin)
type_of(`$`)             # closure (`typeof` returns special)

type_alike(1L, 1)
type_alike(1L, 1.1)
type_alike(integer(), numeric(100))
type_alike(integer(), numeric(101))  # too long