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Negating a function changes TRUE
to FALSE
and FALSE
to TRUE
.
negate(.p)
A new predicate function.
A predicate function (i.e. a function that returns either TRUE
or FALSE
) specified in one of the following ways:
A named function, e.g. is.character
.
An anonymous function, e.g. \(x) all(x < 0)
or function(x) all(x < 0)
.
A formula, e.g. ~ all(.x < 0)
. You must use .x
to refer to the first
argument). Only recommended if you require backward compatibility with
older versions of R.
This function is called an adverb because it modifies the effect of a function (a verb). If you'd like to include a function created an adverb in a package, be sure to read faq-adverbs-export.
Other adverbs:
auto_browse()
,
compose()
,
insistently()
,
partial()
,
possibly()
,
quietly()
,
safely()
,
slowly()
x <- list(x = 1:10, y = rbernoulli(10), z = letters)
x |> keep(is.numeric) |> names()
x |> keep(negate(is.numeric)) |> names()
# Same as
x |> discard(is.numeric)
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