notin: Find non-matching values
In toniprice/jutebag: Sundry Utility Functions

Description Usage Arguments Value Examples

Returns non-matching values for its left operand when compared to the right operand.

1	x %notin% y

`x`	vector or NULL: values to be compared.
`y`	vector or NULL: values for which non-matches should be returned.

a logical vector indicating if there is no match for its left operand.

foo <- letters[1:6]
foo[foo %notin% c("a", "c", "e")]
# => [1] "b" "d" "f"

lst <- list(a = 1, b = 2, c = 3, d = 4)
lst[names(lst) %notin% c("a", "c", "d")]
# =>
# $b
# [1] 2

NULL %notin% c(1, 2)
# => logical(0)

c("a", "b", "c") %notin% NULL
# => [1] TRUE TRUE TRUE