Singleton Methods and the Eigenclass - The Ruby Programming Language …
WebThe eigenclass is also called the singleton class or (less commonly) the metaclass. The term “eigenclass” is not uniformly accepted within the Ruby community, but it is the term we’ll use in this book. Ruby defines a syntax for opening the eigenclass of an object and adding methods to it. This provides an alternative to defining singleton ...
eigenclass - Ruby looks for class variable in the Object instead of ...
Web1 Jul 2014 · but if I try eigenclass: def example1.get_var1 @@var1 end example1.get_var1 # NameError: uninitialized class variable @@var1 in Object # from (pry):128:in `get_var1' Ruby looks @@var1 in the Object instead of the Example. I have tested this code in the Ruby 1.9.3 and 2.0 with the same result. Why does it happening?
Ruby eigenclass (sigleton class) created? For which?
Web13 Jul 2014 · From the famous textbook "Programming Ruby", by defining cat.poop, what actually happens is Ruby created an anonymous class, aka singleton or eigenclass, that is now the class of the cat object, then the original String class becomes the superclass of the newly created eigenclass. Then this confused me. See the following code:
Why is it important to learn about metaprogramming and eigenclasses in ...
Web29 Dec 2011 · 1. +1 I really like the attr_accessor example, as it shows important benefit of strong metaprogramming capabilities: metaprogramming keeps the language itself simple. attr_accessor could easily be a separate language construct in another language (related: properties in C# etc.). In Ruby, it is merely another method. – Mladen Jablanović.
3 ways to make class methods private in Ruby - Medium
Web13 Sep 2020 · The classic way to make class methods private is to open the eigenclass and use the private keyword on the instance methods of the eigenclass — which is what you commonly refer to as class ...
ruby - Implicit context and eigenclasses - Stack Overflow
Web4 Nov 2012 · In Ruby, all objects have an eigenclass. Actually, the definition of "class methods" is just an interpretation of its concept. "Class Methods" are not really class methods, but methods defined in the eigenclass of the class. So, when you are calling a "class method", you are indeed calling an object method.
ruby - Why fixnum doesn't have eigenclass? - Stack Overflow
Web6 Oct 2016 · As the Ruby Docs say: There is effectively only one Fixnum object instance for any given integer value, so, for example, you cannot add a singleton method to a Fixnum. The same is true for Bignum , Float and Symbol
ruby - How to make a module constant also visible within an eigenclass ...
Web13 Jan 2017 · Ruby eigenclass unexpected behaviour. 0. Include a module and access a class'es constant. 2. Module inclusion in ruby eigen class. 2. Ruby - Share local variable with the obj's eigenclass. 5. Ruby metaprogramming: How can make module method see class's variable. Hot Network Questions
eigenclass - Can a Ruby object have multiple eigenclasses
Web1 Feb 2017 · ruby; eigenclass; Share. Improve this question. Follow edited Feb 1, 2017 at 9:43. Andrey Deineko. 51.9k 10 10 gold badges 113 113 silver badges 147 147 bronze badges. asked Feb 1, 2017 at 9:33. Kevin Van Ryckegem Kevin Van Ryckegem. 1,935 3 3 gold badges 30 30 silver badges 55 55 bronze badges.
Alternate notation for eigenclass - Ruby - Ruby-Forum
Web13 Mar 2006 · Rather then using a specific method for accessing the singleton/eigennclass, could we just use an alternate to dot-notation. I.e. Instead of ‘x.eigenclass.foo’ either ‘x:foo’ or ‘x!foo’, or somthing like that. I haven’t given a great deal of thought, and don’t really have time to, but it popped into my mind today, so I decided to just throw it out there. T.
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