Setter doesn't work with -=, +=, etc? [duplicate]

Answer 1

UPDATE: It's not clear whether you want an instance variable or a class variable for 'var'. The example below is for an instance variable.

I would use attr_reader, or attr_accessor if you want to do this external to the class.

class Test
   attr_reader :var

   def initialize
      @var=2.4
   end

   def test
     puts @var
     @var -= 1
     puts @var
     @var = @var - 1
     puts @var
   end
end

t=Test.new
t.test
puts t.var

$ /tmp/t.rb
2.4
1.4
0.3999999999999999
0.3999999999999999