我有一个值“狗”和一个数组[“猫”、“狗”、“鸟”]。

如何在不循环的情况下检查数组中是否存在它?是否有一种简单的方法来检查该值是否存在?


当前回答

如果要在MiniTest单元测试中执行此操作,可以使用assert_includes。例子:

pets = ['Cat', 'Dog', 'Bird']
assert_includes(pets, 'Dog')      # -> passes
assert_includes(pets, 'Zebra')    # -> fails 

其他回答

['Cat', 'Dog', 'Bird'].detect { |x| x == 'Dog'}
=> "Dog"
!['Cat', 'Dog', 'Bird'].detect { |x| x == 'Dog'}.nil?
=> true

您正在查找包含项?:

>> ['Cat', 'Dog', 'Bird'].include? 'Dog'
=> true

还有另一种方法。

假设数组是[:edit,:update,:create,:show],那么可能就是七宗致命/宁静的罪。

还有一个想法,就是从某个字符串中提取一个有效的动作:

"my brother would like me to update his profile"

然后:

[ :edit, :update, :create, :show ].select{|v| v if "my brother would like me to update his profile".downcase =~ /[,|.| |]#{v.to_s}[,|.| |]/}

这不仅会告诉你它存在,还会告诉你它出现的次数:

 a = ['Cat', 'Dog', 'Bird']
 a.count("Dog")
 #=> 1

如果需要多次检查任何键,请将arr转换为哈希,然后检查O(1)

arr = ['Cat', 'Dog', 'Bird']
hash = arr.map {|x| [x,true]}.to_h
 => {"Cat"=>true, "Dog"=>true, "Bird"=>true}
hash["Dog"]
 => true
hash["Insect"]
 => false

Hash#has_key的性能?与Array#include相比?

Parameter              Hash#has_key?                 Array#include 

Time Complexity         O(1) operation                O(n) operation 

Access Type             Accesses Hash[key] if it      Iterates through each element
                        returns any value then        of the array till it
                        true is returned to the       finds the value in Array
                        Hash#has_key? call
                        call    

对于一次性检查,使用include?很好