Changing an Object-encapsulated Array

Question

Here is a minimal example of a data structure encapsulated by a class. The data structure should be accessible by class methods. Hence, I want to control the access for example to forbid certain modifications.

    class List
      attr_accessor :array

      def initialize
        @array = ["b"]
      end

      def addElement(v)
        @array.insert(v)
      end
    end


    a = List.new
    puts a.array.to_s
    a.addElement("a")
    puts a.array.to_s

The output is

["b"]
["b"]

The problem occured while using the graph theory gem plexus. The above is just a minimal example. I am trying to learn Ruby from a Java background.

Ajedi32 · Accepted Answer · 2014-04-18 16:38:41Z

1

You're using Array#insert wrong. Consider using Array#<< or Array#push instead.

answered Apr 18, 2014 at 16:38

Ajedi32

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