使用.include检查数组中的多个项目？ - Ruby初学者

Question

有没有更好的方法来写这个:

if myarray.include? 'val1' ||
   myarray.include? 'val2' ||
   myarray.include? 'val3' ||
   myarray.include? 'val4'

Answer 1

使用set intersectionctions(Array#:&):

(myarray & ["val1", "val2", "val3", "val4"]).present?

你也可以循环(any?将在第一次出现时停止):

myarray.any? { |x| ["val1", "val2", "val3", "val4"].include?(x) }

这对小型数组来说没问题,在一般情况下你最好有O(1)谓词:

values = ["val1", "val2", "val3", "val4"].to_set
myarray.any? { |x| values.include?(x) }

使用Ruby> = 2.1,使用Set#intersect:

myarray.to_set.intersect?(values.to_set)

Answer 2

创建您自己的可重用方法：

class String
  def include_any?(array)
    array.any? {|i| self.include? i}
  end
end

用法

"a string with many words".include_any?(["a", "string"])