为什么MyObject.new。class === == MyObject评估为false?

I do the following, and it evaluates to false:

我这样做，它的值为false:

MyObject.new.class === MyObject

However,

然而,

MyObject.new.class == MyObject

evaluates to true. Can someone with a bit more Ruby background explain this to me, and if it's okay to use == for this purpose?

评估为true。有Ruby背景的人能给我解释一下吗?

1 个解决方案

#1

In Ruby, === isn't a stricter version of ==, as it is in some other languages.

在Ruby中，===不是更严格的==，因为它是其他语言的。

The === method has several meanings:

==方法有几个含义:

Membership:

(1..10) === 5       # => true

Test whether the argument is an instance of the receiver:

p MyObject.new.class === MyObject.new  # true; it's the same as 
p MyObject.new.is_a? MyObject

Regex match:

/\w+/ === "Ruby"

Case statements:

year = 2011

case year
when 1901..2000
  puts 'Second millennium'
when 2001..2999
  puts 'Third millennium'
end

Other meanings, see ri ===

MyObject.new.class == MyObject is just a normal equality test (MyObject is a class object, and MyObject.new.class is the same class object)

MyObject.new。class == = MyObject只是一个普通的相等性测试(MyObject是一个类对象，myobjecter .new)。类是同一个类对象)