zig/doc/langref/testing_null_with_if.zig

const print = @import("std").debug.print;
pub fn main() void {
    const optional_number: ?i32 = null;

    if (optional_number) |number| {
        print("got number: {}\n", .{number});
    } else {
        print("it's null\n", .{});
    }
}

// exe=succeed