空の2次元配列の結合を.concatで意図した結合ができない 2`buff`2`.concat` # [1, 2, 3, 4][10, 11, 12, 13] buff[0] = [1, 2, 3, 4] buff[1] = [10, 11, 12, 13] `buff`ID buff = Array.new(2, []) p buff buff[0].concat([1, 2, 3, 4]) p buff buff[1].concat([10, 11, 12, 13]) p buff

buff[0]buff[1]



buff = Array.new(2){[]}






buff[0] += [1, 2, 3, 4]
buff[1] += [10, 11, 12, 13]