2, 3, 4, 5] => [1, 2, 3, 4, 5] >> a.class => Array >> a.max => 5 >> a.m [TAB][TAB] array.map array.map! array.max array.max_by ... >> a.reverse => [5, 4, 3, 2, 1] >> a => [1, 2, 3, 4, 5] >> a.reverse! => [5, 4, 3, 2, 1] >> a => [5, 4, 3, 2, 1] >> a.sort! => [1, 2, 3, 4, 5] >> a => [1, 2, 3, 4, 5] Monday, October 15, 12