hasName
Check for Name
hasName is a convenient way to test for one or more names
in an R object.
Usage
hasName(x, name)Arguments
- x
Any object.
- name
One or more character values to look for.
Details
hasName(x, name) is defined to be equivalent to
name %in% names(x), though it will evaluate slightly more
quickly. It is intended to replace the common idiom
!is.null(x$name). The latter can be unreliable due to partial
name matching; see the example below.
Value
A logical vector of the same length as name containing
TRUE if the corresponding entry is in names(x).
See Also
Examples
library(utils)
# NOT RUN {
x <- list(abc = 1, def = 2)
!is.null(x$abc) # correct
!is.null(x$a) # this is the wrong test!
hasName(x, "abc")
hasName(x, "a")
# }
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