数组是否包含另一个数组的任何值

Question

我有一个数组a = ["1","2","3","6","7"]和另一个数组b = ["2","4","7"]。我想检查b中是否存在a的任何内容。

Answer 1

这很简单：

(a & b).blank?

实际上它做了什么，它需要两个数组的intersection并返回结果，然后检查结果是否为空/空。

Answer 2

你可以做到

a = ["1","2","3","6","7"]
b = ["2","4","7"]
b.any? { |e| a.include?(e) }

Answer 3

使用Ruby的&运算符，它将返回一个值为intersection的数组为两个数组的数组，下面是一个示例。

pry(main)> a = ["1","2","3","6","7"]
=> ["1", "2", "3", "6", "7"]
pry(main)> b = ["2","4","7"]
=> ["2", "4", "7"]
pry(main)> a & b
=> ["2", "7"]
pry(main)> (a & b).empty?
=> false

在Rails中，您还可以使用blank?

pry(main)> (a & b).blank?
=> false

希望上面的例子有帮助