2007-07-18 配列演算 Ruby ■誤解していると、バグの原因になるね [ [1,2],[3,4] ] + [ [5,6] ] = [ [1,2],[3,4],[5,6] ] [ [1,2],[3,4] ] << [ [5,6] ] != [ [1,2],[3,4],[5,6] ] [ [1,2],[3,4] ] << [5,6] = [ [1,2],[3,4],[5,6] ]