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Introduction

Too Many Instance Variables is a special case of LargeClass.

Example

Given this configuration

TooManyInstanceVariables:
  max_instance_variables: 3

and this code:

class TooManyInstanceVariables
  def initialize
    @arg_1 = :dummy
    @arg_2 = :dummy
    @arg_3 = :dummy
    @arg_4 = :dummy
  end
end

reek would emit the following warning:

test.rb -- 5 warnings:
  [1]:TooManyInstanceVariables has at least 4 instance variables (TooManyInstanceVariables)

Current Support in reek

reek only counts the instance variables you use explicitly like in the example above. Class macros like attr_accessor are disregarded.

Configuration

reek's Too Many Instance Variables detector offers the Basic Smell Options, plus: