type-predicates

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Type predicates

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)

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.

See Also

bare-type-predicates scalar-type-predicates

Aliases
  • type-predicates
  • is_list
  • is_atomic
  • is_vector
  • is_numeric
  • is_integer
  • is_double
  • is_character
  • is_logical
  • is_null
  • is_function
Documentation reproduced from package purrr, version 0.2.2.2, License: GPL-3 | file LICENSE

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