rlang: type-predicates – R documentation

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type-predicates

Type predicates

Description

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.

Usage

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)

Arguments

`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 `NA`, `Inf`, `-Inf` and `NaN`. Setting this to something other than `NULL` can be expensive because the whole vector needs to be traversed and checked.

Details

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).

type-predicates

Description

Usage

Arguments

Details

See Also

rlang

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