你可以使用+运算符!

irb(main):001:0> a = [1,2]
=> [1, 2]
irb(main):002:0> b = [3,4]
=> [3, 4]
irb(main):003:0> a + b
=> [1, 2, 3, 4]

你可以在这里阅读关于数组类的所有内容: http://ruby-doc.org/core/classes/Array.html

somearray = ["some", "thing"]
anotherarray = ["another", "thing"]
somearray + anotherarray # => ["some", "thing", "another", "thing"]
somearray.concat anotherarray # => ["some", "thing", "another", "thing"]
somearray.push(anotherarray).flatten # => ["some", "thing", "another", "thing"]
somearray.push *anotherarray # => ["another", "thing", "another", "thing"]
 

我很惊讶没有人提到reduce，当你有一个数组的数组时，它工作得很好:

lists = [["a", "b"], ["c", "d"]]
flatlist = lists.reduce(:+)  # ["a", "b", "c", "d"]

我发现更容易推入或追加数组，然后将它们压平，如下所示:

somearray = ["some", "thing"]
anotherarray = ["another", "thing"]
somearray.push anotherarray # => ["some", "thing", ["another", "thing"]]
#or
somearray << anotherarray # => ["some", "thing", ["another", "thing"]]
somearray.flatten!  # => ["some", "thing", "another", "thing"]
somearray # => ["some", "thing", "another", "thing"]

本质上，问题是“如何在Ruby中连接数组”。自然，答案是使用concat或+，几乎在每个答案中都提到过。

对这个问题的自然扩展是“如何在Ruby中按行执行2D数组的连接”。当我在谷歌上搜索“红宝石串联矩阵”时，这个SO问题是最上面的结果，所以我想我应该把我的答案留给后人(没有问过但相关的)。

在一些应用程序中，你可能想要按行“连接”两个2D数组。类似的,

[[a, b], | [[x],    [[a, b, x],
 [c, d]] |  [y]] =>  [c, d, y]]

这有点像“增广”矩阵。例如，我使用这种技术创建了一个邻接矩阵来表示一组较小的矩阵中的图。如果没有这种技术，我将不得不以一种容易出错或令人沮丧的方式迭代组件。例如，我可能不得不做一个each_with_index。相反，我将zip和flatten组合如下:

# given two multi-dimensional arrays that you want to concatenate row-wise
m1 = [[:a, :b], [:c, :d]]
m2 = [[:x], [:y]]

m1m2 = m1.zip(m2).map(&:flatten)
# => [[:a, :b, :x], [:c, :d, :y]]

如果新数据可以是数组或标量，并且如果它是数组，则希望防止新数据嵌套，splat操作符非常棒!它为标量返回一个标量，为数组返回一个已解压的参数列表。

1.9.3-p551 :020 > a = [1, 2]
 => [1, 2] 
1.9.3-p551 :021 > b = [3, 4]
 => [3, 4] 
1.9.3-p551 :022 > c = 5
 => 5 
1.9.3-p551 :023 > a.object_id
 => 6617020 
1.9.3-p551 :024 > a.push *b
 => [1, 2, 3, 4] 
1.9.3-p551 :025 > a.object_id
 => 6617020 
1.9.3-p551 :026 > a.push *c
 => [1, 2, 3, 4, 5] 
1.9.3-p551 :027 > a.object_id
 => 6617020