Maximum Key Value

Returns the largest key currently present in the ordered sequence.

Usage

max_key(x)

Arguments

x

An ordered_sequence.

Value

Maximum key, or NULL when x is empty.

Details

Uses cached .oms_max_key monoid state.

Examples

x <- ordered_sequence("a", "b", keys = c(2, 1))
max_key(x)
#> [1] 2
max_key(ordered_sequence())
#> NULL