> ('1'..'10').to_a => ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10"] > ('2'..'10').to_a => [] > ('3'..'10').to_a => [] > ('2'..'20').to_a => ["2", "3", "4", "5", "6", "7", "8", "9", . . . . ., "18", "19", "20"] > ('3'..'20').to_a => [] > ('10'..'20').to_a => ["10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20"] > (1..10).to_a => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] > (2..10).to_a => [2, 3, 4, 5, 6, 7, 8, 9, 10] > (3..10).to_a => [3, 4, 5, 6, 7, 8, 9, 10]
update:
> (’2′..’10′).to_a => []
เพราะมันเรียงลำดับตามตัวอักษรสิครับ '2' มีค่ามากกว่า '10' (อย่าลืมว่ามันเป็นสตริง มันจะไล่เทียบจากอักษรตัวแรก ไม่ได้เทียบจากค่าของตัวอักษร)
