Ruby-on-rails 使用 .include 检查数组中的多个项目？-- 红宝石初学者
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Check for multiple items in array using .include? -- Ruby Beginner
提问by Hopstream
Is there a better way to write this:
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'
回答by tokland
Using set intersections (Array#:&):
使用集合交集（Array#:&）：
(myarray & ["val1", "val2", "val3", "val4"]).present?
You can also loop (any?will stop at the first occurrence):
您还可以循环（any?将在第一次出现时停止）：
myarray.any? { |x| ["val1", "val2", "val3", "val4"].include?(x) }
That's ok for small arrays, in the general case you better have O(1) predicates:
这对于小数组来说没问题，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) }
With Ruby >= 2.1, use Set#intersect:
使用 Ruby >= 2.1，使用Set#intersect：
myarray.to_set.intersect?(values.to_set)
回答by Jeremy Lynch
Create your own reusable method:
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
Usage
用法
"a string with many words".include_any?(["a", "string"])
