Before/after let comparison

after.rb

  class Delegator
    takes :request, :route_path, :resource, :delegate_name

    let(:delegate_method) { @resource.record_class.method(method_name) }
    let(:method_name) { @delegate_name.split('.').last.to_sym }

    def delegate
      delegate_method.call(*delegate_args)
    end

    def delegate_args
      inference_sources = InferenceSources.new(@request,
                                               @route_path,
                                               @request.path_info).sources
      InfersArgs.new(delegate_method, inference_sources).args
    end
  end

before.rb

  class Delegator
    def initialize(request, route_path, resource, delegate_name)
      @request = request
      @route_path = route_path
      @resource = resource
      @delegate_name = delegate_name
    end

    def delegate
      delegate_method.call(*delegate_args)
    end

    def delegate_args
      inference_sources = InferenceSources.new(@request,
                                               @route_path,
                                               @request.path_info).sources
      InfersArgs.new(delegate_method, inference_sources).args
    end

    def delegate_method
      @resource.record_class.method(method_name)
    end

    def method_name
      @delegate_name.split('.').last.to_sym
    end
  end