测试多个变量是否具有相同值的简单方法,ruby

Question

有一种简单的方法可以测试多个变量在ruby中具有相同的值吗？

有点像这样:

if a == b == c == d #does not work
   #Do something because a, b, c and d have the same value
end

当然可以针对主机检查每个变量以查看它们是否都是真的,但这是更多的语法并且不那么清楚.

if a == b && a == c && a == d #does work
    #we have now tested the same thing, but with more syntax.
end

你需要这样的东西的另一个原因是你在测试之前是否确实对每个变量都有效.

if array1.sort == array2.sort == array3.sort == array4.sort #does not work
    #This is very clear and does not introduce unnecessary variables
end
#VS
tempClutter = array1.sort
if tempClutter == array2.sort && tempClutter == array3.sort && tempClutter == array4.sort #works
   #this works, but introduces temporary variables that makes the code more unclear
end

Answer 1

将它们全部扔进一个数组,看看是否只有一个唯一的项目.

if [a,b,c,d].uniq.length == 1
  #I solve almost every problem by putting things into arrays
end

正如sawa在评论中指出的那样.如果它们都是假的或者为零则失败.

Answer 2

托克兰在对类似问题的评论中提出了一个非常好的方法:

module Enumerable
  def all_equal?
    each_cons(2).all? { |x, y| x == y }
  end
end

到目前为止,这是表达我最清楚的方式.