Simple DSL at Ruby

dsl.rb

class DSL
  def initialize &block
    @params = {}
    instance_eval &block
  end

  def param key, value
    @params[key] = value
  end

  def to_s
    @params.to_s
  end

  def [] key
    @params[key]
  end

  def []= key,value
    @params[key] = value
  end
end

config = DSL.new do
  param :a, 1
  param :b, 2
end

config[:c] = 15

puts config