ruby – 比较相等的字符串在Hash中找不到相同的对象

我有两个字符串看起来相等：

context = "Marriott International World’s Most ADMIRED Lodging Company by FORTUNE for 14th yr. via @FortuneMagazine http://cnnmon.ie/1kcfZSQ"
slice_str = context.slice(105,24) # => "http://cnnmon.ie/1kcfZSQ"
str = "http://cnnmon.ie/1kcfZSQ"

slice_str == str                  # => true
slice_str.eql? str                # => true

但是当我在一个哈希中查找值时,键是字符串,它们在Ruby 2.1.0和Ruby 2.1.1中不会返回相同的东西：

redirects = {"http://cnnmon.ie/1kcfZSQ"=>""}
redirects.key?(slice_str)         # => false
redirects.key?(str)               # => true

这个行为有什么解释？ Ruby 1.9.3按预期工作.

解决方法

这是一个ruby的错误2.1.3

$rvm use 2.1.2
Using /Users/richniles/.rvm/gems/ruby-2.1.2
$irb
2.1.2 :001 > context = "Marriott International World’s Most ADMIRED Lodging Company by FORTUNE for 14th yr. via @FortuneMagazine http://cnnmon.ie/1kcfZSQ"
 => "Marriott International World’s Most ADMIRED Lodging Company by FORTUNE for 14th yr. via @FortuneMagazine http://cnnmon.ie/1kcfZSQ" 
2.1.2 :002 > slice_str = context.slice(105,24) # => "http://cnnmon.ie/1kcfZSQ"
 => "http://cnnmon.ie/1kcfZSQ" 
2.1.2 :003 > str = "http://cnnmon.ie/1kcfZSQ"
 => "http://cnnmon.ie/1kcfZSQ" 
2.1.2 :004 > redirects = {"http://cnnmon.ie/1kcfZSQ"=>""}
 => {"http://cnnmon.ie/1kcfZSQ"=>""} 
2.1.2 :005 > redirects.key?(slice_str) 
 => false 
2.1.2 :006 > redirects.key?(str)  
 => true

但是在ruby 2.1.3中也是一样：

$rvm use 2.1.3
 Using /Users/richniles/.rvm/gems/ruby-2.1.3
 $irb
 2.1.3 :001 > context = "Marriott International World’s Most ADMIRED Lodging Company by FORTUNE for 14th yr. via @FortuneMagazine http://cnnmon.ie/1kcfZSQ"
  => "Marriott International World’s Most ADMIRED Lodging Company by FORTUNE for 14th yr. via @FortuneMagazine http://cnnmon.ie/1kcfZSQ" 
 2.1.3 :002 > slice_str = context.slice(105,24) # => "http://cnnmon.ie/1kcfZSQ"
  => "http://cnnmon.ie/1kcfZSQ" 
 2.1.3 :003 > str = "http://cnnmon.ie/1kcfZSQ"
  => "http://cnnmon.ie/1kcfZSQ" 
 2.1.3 :004 > redirects = {"http://cnnmon.ie/1kcfZSQ"=>""}
  => {"http://cnnmon.ie/1kcfZSQ"=>""} 
 2.1.3 :005 > redirects.key?(slice_str) 
  => true 
 2.1.3 :006 > redirects.key?(str)  
  => true

原文链接：https://www.f2er.com/ruby/266716.html

ruby – 比较相等的字符串在Hash中找不到相同的对象

解决方法

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