R: Does the variable exist?

assert_all_are_existing {assertive.code}

R Documentation

Does the variable exist?

Description

Checks to see if the input variables exist.

Usage

assert_all_are_existing(x, envir = parent.frame(), inherits = TRUE,
  severity = getOption("assertive.severity", "stop"))

assert_any_are_existing(x, envir = parent.frame(), inherits = TRUE,
  severity = getOption("assertive.severity", "stop"))

is_existing(x, envir = parent.frame(), inherits = TRUE,
  .xname = get_name_in_parent(x))

Arguments

`x`	Input to check.
`envir`	Passed to `exists`.
`inherits`	Passed to `exists`.
`severity`	How severe should the consequences of the assertion be? Either `"stop"`, `"warning"`, `"message"`, or `"none"`.
`.xname`	Not intended to be used directly.

Value

is_existing is a vectorized wrapper to exists, providing more information on failure (and with a simplified interface). The assert_* functions return nothing but throw an error if is_existing returns FALSE.

Examples

e <- new.env()
e$x <- 1
e$y <- 2
assert_all_are_existing(c("x", "y"), envir = e)
#These examples should fail.
assertive.base::dont_stop(assert_all_are_existing(c("x", "z"), envir = e))