Ruby：2维数组

Question

如何在Ruby中声明2维数组。我知道，V=[]是一维的。但{2}的v=[][]？在一个块中，我想在数组中添加值作为子数组。即V=[["ab","ba"]，["12","21"]]。这就是我在做的事情。让x=[]。我拿每个元素，存储原始元素和反向元素。

x.each{|k| l=k_reverse v=(k,l)}

Answer 1

# Given
list = ["ab","12"]
# This should give you an array of arrays
v = list.map{|x| [x,x.reverse] }
# v = [["ab","ba"],["12","21"]]

二维数组可能被初始化为

v = [[]] # not [][], [][] would be the reader for a 2 dim array