配列を小さい配列に分割する
a = [1,2,3, 4,5,6, 7,8,9, 10] res = [] while a.size > 0 res << a.slice!(0, 3) end p res # => [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10]]
a = [1,2,3, 4,5,6, 7,8,9, 10] res = [] while a.size > 0 res << a.slice!(0, 3) end p res # => [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10]]