如何在ruby中合并两个数组对象？

Question

如果我从两个数组开始，例如：

array1 = [{"ID":"1","name":"Dog"}]
array2 = [{"ID":"2","name":"Cat"}]

如何将此数组合并为一个这样的数组？

arraymerge = [{"ID":"1","name":"Dog"}, {"ID":"2","name":"Cat"}]

Answer 1

array1 = [{ID:"1",name:"Dog"}]
array2 = [{ID:"2",name:"Cat"}]
p array1 + array2
# => [{:ID=>"1", :name=>"Dog"}, {:ID=>"2", :name=>"Cat"}]

或者这可能是多余的：

array1 = [{ID:"1",name:"Dog"}]
array2 = [{ID:"2",name:"Cat"}]
array3 = [{ID:"3",name:"Duck"}]

p [array1, array2, array3].map(&:first)
# => [{:ID=>"1", :name=>"Dog"}, {:ID=>"2", :name=>"Cat"}, {:ID=>"3", :name=>"Duck"}]

Answer 2

您的问题的其他答案是使用Array#concat：

array1 = [{"ID":"1","name":"Dog"}]
array2 = [{"ID":"2","name":"Cat"}]

array1.concat(array2)
# [{"ID":"1","name":"Dog"}, {"ID":"2","name":"Cat"}]

Answer 3

只需将它们添加到一起：

irb(main):005:0> puts array1+array2
{:ID=>"1", :name=>"Dog"}
{:ID=>"2", :name=>"Cat"}

或者：

irb(main):006:0> p array1+array2
[{:ID=>"1", :name=>"Dog"}, {:ID=>"2", :name=>"Cat"}]

另请参阅：Merge arrays in Ruby/Rails

Answer 4

您可以使用+运算符来执行此操作

array1 = [{"ID":"1","name":"Dog"}]
array2 = [{"ID":"2","name":"Cat"}]

arraymerge = array1 + array2
#=> [{:ID=>"1", :name=>"Dog"}, {:ID=>"2", :name=>"Cat"}]