查找两个数组之间的共同值

Question

如果我想比较两个数组,并创建一个插值输出字符串,如果从数组的数组变量y中存在x我怎么能获得每个匹配元素的输出？

这就是我的尝试但却没有得到结果.

x = [1, 2, 4]
y = [5, 2, 4]
x.each do |num|
  puts " The number #{num} is in the array" if x.include?(y.each)
end #=> [1, 2, 4]

Answer 1

您可以使用set intersection方法&:

x = [1, 2, 4]
y = [5, 2, 4]
x & y # => [2, 4]

Answer 2

x = [1, 2, 4]
y = [5, 2, 4]
intersection = (x & y)
num = intersection.length
puts "There are #{num} numbers common in both arrays. Numbers are #{intersection}"

将输出:

There are 2 numbers common in both arrays. Numbers are [2, 4]