hasanuzzaman sumon

Different way to declare class method to Ruby Class

2015/10/24

There are many ways to declare class method in ruby.

Most common way of declare class method is:

Using most common self

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class Foo
    def self.capitalize_name
      "My captalize name is #{name.upcase}"
    end
end

print MyClass.capitalize_name # => My captalize name is Foo

In this method we use class name instead of self:

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# approach 2
class Foo
  def Foo.capitalize_name
    "My captalize name is #{name.upcase}"
  end
end

print MyClass.capitalize_name # => My captalize name is Foo

First declare class without method, then add method:

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# approach 3
class Foo;end
# defining a class method out with the class definition
def Foo.capitalize_name
name.upcase
end

print MyClass.capitalize_name # => My captalize name is Foo

First declare class without method, then add method:

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# approach 4
# define a new class named MyClass
# here we can see that our declare class just object of Class
Foo = Class.new
# add the capitalize_name to MyClass
def Foo.capitalize_name
name.upcase
end

print MyClass.capitalize_name # => My captalize name is Foo

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