Reverse iterate over a array/list in Zig

reverse-iterate.zig

const std = @import("std");

pub fn main() void {
    var list = [_]u8{ 1, 2, 3, 4, 5, 6, 7, 8, 9 };

    // `i = i -% 1` is wrapping subtraction.
    // `i -%= 1`
    var i: u32 = list.len - 1;
    while (i < list.len) : (i -%= 1) {
        std.log.debug("i: {d} list[{d}] -> {d}", .{ i, i, list[i] });
    }
}