negate {purrr}

R Documentation

Negate a predicate function.

Description

Negate a predicate function.

Usage

negate(.p)

Arguments

.p

A single predicate function, a formula describing such a predicate function, or a logical vector of the same length as .x. Alternatively, if the elements of .x are themselves lists of objects, a string indicating the name of a logical element in the inner lists. Only those elements where .p evaluates to TRUE will be modified.

Value

A new predicate function.

Examples

Run examples

negate("x")
negate(is.null)
negate(~ .x > 0)

x <- transpose(list(x = 1:10, y = rbernoulli(10)))
x %>% keep("y") %>% length()
x %>% keep(negate("y")) %>% length()
# Same as
x %>% discard("y") %>% length()

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