CODEWITHSUNDEEP
ruby
user2613217
user2613217

Reputation:

What is created by Class.new.new

Class.new.new
# => #<#<Class:0x44f3a2>:0xd7244e>

I am curious to know what is created. Is it an object of object? Any technical explanation will be appreciated.

Upvotes: 3

Views: 97

Answers (4)

Shoe
Shoe

Reputation: 76240

With Class.new you are creating a new class. In fact not only you can create classes via the common syntax:

class Bird
    def is
        "word"
    end
end

but you can also use Class::new like this:

Bird = Class.new do
    def is
        "word"
    end
end

In the above example you can run Bird.new.is and it will return "word" just like in the first example. It is useful to create anonymous classes or classes that you can rename at your will. In your case:

Class.new.new

By simply calling Class.new you are creating a new anonymous class with no custom methods or instance variables which is then later instantiated via the second new method.

Upvotes: 6

Shadwell
Shadwell

Reputation: 34774

You can follow it through in the console:

irb(main):011:0> c = Class.new
=> #<Class:0x000000028245e0>

c is a new class.

irb(main):012:0> c.new
=> #<#<Class:0x000000028245e0>:0x0000000282a170>

Calling c.new returns you a new instance of the new class you just created.

Upvotes: 3

yfeldblum
yfeldblum

Reputation: 65435

my_class = Class.new # makes a new class which is a subclass of Object
my_instance = my_class.new # makes a new instance object of the class

Upvotes: 0

Marek Lipka
Marek Lipka

Reputation: 51151

Class.new creates and returns Class instance (which is class). If you call on it new again, previously created class will be instantiated.

Upvotes: 1

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