Function withBack
Takes a unary function that is called on back of range if it is there
auto auto withBack(alias fun, Range)
(
Range range
)
if (from .std .range .isBidirectionalRange!Range);
Since
- 0.0.1
Example
import ddash .utils .optional: some, none;
assert((int[]) .init .withBack!(a => a * a) == none);
assert([3, 2] .withBack!(a => a * a) == some(4));
assert([3, 5] .withBack!"a + 1" == some(6));