type-predicates: Type predicates

In imanuelcostigan/predrcats: Predicate Functions with Sane Interfaces and Behaviours

Description

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.

Usage

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)

is_complex(x)

is_raw(x)

is_name(x)

is_call(x)

is_language(x)

Arguments

x	object to be tested.

Details

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.

Value

TRUE or FALSE.

See Also

Other type.predicates: bare-type-predicates, scalar-type-predicates

Examples

is_atomic(NULL)
is_vector(1:3)
is_vector(list(1:3))
is_numeric(1)
is_numeric(1:3)
is_integer(1:3)
is_double(1:3)
is_double(c(1, 2, 3))
is_atomic(as.Date("2013-01-01"))
is_numeric(as.Date("2013-01-01"))
is_numeric(as.POSIXct("2013-01-01"))
is_character(letters)
is_character(factor(letters))
is_integer(factor(letters))
is_logical(NA)

imanuelcostigan/predrcats documentation built on May 18, 2019, 4:45 a.m.