Feature Parity in 25% of the Dev Hours With MicroObjects @TheQuinnGil https://QuinnGil.com

MicroObjects Object Oriented Practices to the Extreme

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Primary Philosophy

Primary Philosophy Single Responsibility

Single Responsibility What’s its job?

Single Responsibility Single Behavior

Technical Practices… ● No Getters / No Setters ● Always Immutable ● No ‘new’ Inline ● No Primitive Obsession ● Encapsulate Relationships ● ‘if’ Only as Guard Clause ● ‘switch’ & ‘else’ Always Evil ● Composition Over Inheritance ● Interface Everything ● Isolate Their Code ● No Statics ● No nulls

Technical Practices… Drive Single Responsibility ● No Getters / No Setters ● Always Immutable ● No ‘new’ Inline ● No Primitive Obsession ● Encapsulate Relationships ● ‘if’ Only as Guard Clause ● ‘switch’ & ‘else’ Always Evil ● Composition Over Inheritance ● Interface Everything ● No Statics ● No nulls ● Isolate Their Code

Driving Single Responsibility No Getters / No Setters ‘if’s Only as a Guard Clause Isolate Their Code

Driving Single Responsibility No Getters / No Setters

No Getters / No Setters My Definition

No Getters / No Setters class FizzBuzzBag{ public int Input{ get; set; } public string Result{ get; set; } } class FizzBuzzBag: def __init__(self): self._result = None self._input = None @property def result(self): return self._result @result.setter def result(self, value): self._result = value @property def input(self): return self._input @input.setter def input(self, value): self._input = value class FizzBuzzBag{ private int input; private String result; public String getResult(){ return result; } public void setResult(String value){ result = value; } public int getInput(){ return input; } public void setInput(int value){ input = value; } } class FizzBuzzBag attr_accessor :input attr_accessor :result end

No Getters / No Setters No Way

No Getters / No Setters

No Getters Why?

No Getters Behavior

No Getters / No Setters

No Getters / No Setters

No Setters Why?

No Setters Behavior

No Setters Clear Usage

No Getters / No Setters

No Getters / No Setters

No Getters / No Setters class FizzBuzzBag{ public int Input{ get; set; } public string Result{ get; set; } } private void CalcFizzBuzzResult(FizzBuzzBag fb){ var sb = new StringBuilder(); if(ShouldIncludeFizz(fb.Input)){ sb.Append("Fizz"); } if(ShouldIncludeBuzz(fb.Input)){ sb.Append("Buzz"); } fb.Result = sb.Length != 0 ? sb.ToString() : fb.Input.ToString(); }

No Getters / No Setters - Encapsulated Behavior class FizzBuzz{ private readonly int input; public FizzBuzz(int input){ this.input = input; } public string Result(){ var sb = new StringBuilder(); if(ShouldIncludeFizz(input)){ sb.Append("Fizz"); } if(ShouldIncludeBuzz(input)){ sb.Append("Buzz"); } return sb.Length != 0 ? sb.ToString() : input.ToString(); } }

Driving Single Responsibility No Getters / No Setters ‘if’s Only as a Guard Clause Isolate Their Code

‘if’s Only as a Guard Clause Driving Single Responsibility

‘if’s Only as a Guard Clause No Way

‘if’s Only as a Guard Clause Cascading Effect

‘if’s Only as a Guard Clause Success Path

‘if’s Only as a Guard Clause - Success Path class FizzBuzz{ private readonly int input; public FizzBuzz(int input){ this.input = input; } public string Result(){ var sb = new StringBuilder(); if(ShouldIncludeFizz(input)){ sb.Append("Fizz"); } if(ShouldIncludeBuzz(input)){ sb.Append("Buzz"); } return sb.Length != 0 ? sb.ToString() : input.ToString(); } }

‘if’s Only as a Guard Clause - Success Path class FizzBuzz{ private readonly int input; public FizzBuzz(int input){ this.input = input; } public string Result(){ var sb = new StringBuilder(); if(ShouldIncludeFizz(input)){ sb.Append("Fizz"); } if(ShouldIncludeBuzz(input)){ sb.Append("Buzz"); } return sb.Length != 0 ? sb.ToString() : input.ToString(); } } class FizzBuzz{ private readonly int input; public FizzBuzz(int input){ this.input = input; } public string Result(){ if(ShouldBeFizzBuzz(input)) return "FizzBuzz"; if(ShouldBeFizz(input)) return "Fizz"; if(ShouldBeBuzz(input)) return "Buzz"; return input.ToString(); } }

FizzBuzz?

Driving Single Responsibility No Getters / No Setters ‘if’s Only as a Guard Clause Isolate Their Code

Driving Single Responsibility Isolate Their Code

Isolate Their Code OOP Practices

Isolate Their Code - OOP Practices class FizzBuzz{ private readonly string json; public string Result(){ JObject jObject = JObject.Parse(json); int input = jObject.Value("input"); if(ShouldBeFizzBuzz(input)) return "FizzBuzz"; if(ShouldBeFizz(input)) return "Fizz"; if(ShouldBeBuzz(input)) return "Buzz"; return input.ToString(); } }

Isolate Their Code Coupling

Isolate Their Code Commonality

Isolate Their Code Single Behavior

Isolate Their Code - Single Behavior class FizzBuzz{ private readonly string json; private readonly IParser parser; public string Result(){ IParsedObject pObject = parser.Parse(json); int input = pObject.IntValue("input"); if(ShouldBeFizzBuzz(input)) return "FizzBuzz"; if(ShouldBeFizz(input)) return "Fizz"; if(ShouldBeBuzz(input)) return "Buzz"; return input.ToString(); } }

Isolate Their Code - Single Behavior class FizzBuzz{ private readonly IFizzBuzzInput input; public FizzBuzz(IFizzBuzzInput input){ this.input = input; } public string Result(){ if(ShouldBeFizzBuzz(input)) return "FizzBuzz"; if(ShouldBeFizz(input)) return "Fizz"; if(ShouldBeBuzz(input)) return "Buzz"; return input.AsString(); } } class FizzBuzz{ private readonly string json; private readonly IParser parser; public string Result(){ IParsedObject pObject = parser.Parse(json); int input = pObject.IntValue("input"); if(ShouldBeFizzBuzz(input)) return "FizzBuzz"; if(ShouldBeFizz(input)) return "Fizz"; if(ShouldBeBuzz(input)) return "Buzz"; return input.ToString(); } }

Asymmetric Marriage

Driving Single Responsibility No Getters / No Setters ‘if’s Only as a Guard Clause Isolate Their Code

25% of the Dev Hours

● No Getters / No Setters ● Always Immutable ● No ‘new’ Inline ● No Enum ● No Primitive Obsession ● Encapsulate Relationships ● ‘if’ Only as Guard Clause ● ‘switch’ & ‘else’ Always Evil ● Composition Over Inheritance ● Interface Everything ● No Public Statics ● No nulls ● Isolate Their Code

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MicroObjects Single Responsibility to the Extreme @TheQuinnGil https://QuinnGil.com