assertive (version 0.1-7)

assert_all_are_existing: Does the variable exist?

Description

Checks to see if the input variables exist.

Usage

assert_all_are_existing(x, where = -1,
    envir = if (missing(frame)) as.environment(where) else sys.frame(frame),
    frame, mode = "any", inherits = TRUE)

  assert_any_are_existing(x, where = -1,
    envir = if (missing(frame)) as.environment(where) else sys.frame(frame),
    frame, mode = "any", inherits = TRUE)

  is_existing(x, where = -1,
    envir = if (missing(frame)) as.environment(where) else sys.frame(frame),
    frame, mode = "any", inherits = TRUE,
    .xname = get_name_in_parent(x))

Arguments

x

Input to check.

where

Passed to exists.

envir

Passed to exists.

frame

Passed to exists.

mode

Passed to exists.

inherits

Passed to exists.

.xname

Not intended to be used directly.

Value

• is_existing is a vectorised wrapper to exists, providing more information on failure. The assert_* functions return nothing but throw an error if is_existing returns FALSE.

See Also

exists.

Examples

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