Calling instance methods from Class methods in ruby

Question

Is this the right way of calling an Instance method from a class method? Here the instance_var is passed with the Name object. I want to invoke func1 from the instance_var object passed to the class method.

I wrote this :

Class Name
    def initialize
        @name
    end
    def func1(value)
        puts value
    end
    def self.func2(instance_var,val)
        instance_var.func1(val)
    end
end

Why would you need this? But yeah, this would be the way to go, where instance_var is an instance of the Name class — Lee Jarvis
– Lee Jarvis, Commented Aug 3, 2012 at 10:38

knut · Accepted Answer · 2012-08-03 11:45:12Z

3

How do you call func2?

Your code has a small error. You wrote Class instead class. With Class you get a syntax error.

This code works:

class Name
    def func1(value)
        puts value
    end
    def self.func2(instance_var,val)
        instance_var.func1(val)
    end
end

x = Name.new
Name.func2(x, 12)     #12

#or
Name.func2(Name.new, 12)  #12

Your

    def initialize
        @name
    end

will create an empty variable @name. It will never get a value. To assign a value you need:

class Name
    def initialize (var)
        @name = var
    end
end

x = Name.new(:x)

answered Aug 3, 2012 at 11:45

knut

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