CODEWITHSUNDEEP
ruby
Philip Kirkbride
Philip Kirkbride

Reputation: 22889

Do Ruby objects have a built in getter/setter methods?

In some languages, you can access attributes of an object without writing your own getter/setter methods.

Do objects have built in getter/setter with Ruby?

Here is what I'm trying:

class Obj
  def initialize(color)
    @color = color
  end
end

t = Obj.new("red")

puts t.color

Upvotes: 1

Views: 678

Answers (2)

Philip Kirkbride
Philip Kirkbride

Reputation: 22889

I found that these methods seem to exist for all objects in Ruby:

t.instance_variable_set(:@color, "blue")
t.instance_variable_get(:@color)

Upvotes: 0

Simple Lime
Simple Lime

Reputation: 11050

You're looking for attr_accessor :color if you want just the run of the mill auto-generated getters/setters.

Defines a named attribute for this module, where the name is symbol.id2name, creating an instance variable (@name) and a corresponding access method to read it. Also creates a method called name= to set the attribute. String arguments are converted to symbols.

There's also just an attr_reader :color if you don't want to be able to set the value outside the class

Creates instance variables and corresponding methods that return the value of each instance variable.

And attr_writer :color if you want to set, but not read, outside of the class.

Creates an accessor method to allow assignment to the attribute.

class Obj
  attr_accessor :color

  def initialize(color)
    @color = color
  end
end

t = Obj.new("red")
t.color #=> "red"

Upvotes: 7

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