Applying the Rules of Simple Design @adamwathan 

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“I don’t really see the difference. Whether you have two elements in a statement, or two services in some distributed architecture, the principles are the same.” — Kent Beck 

The Rules of Simple Design 1. Passes the tests 2. Reveals intent 

class SalesReport { public function __construct($sales, $startDate, $endDate) { $this->sales = $sales; $this->startDate = $startDate; $this->endDate = $endDate; } public function totalRevenue() { $revenue = 0; foreach ($sales as $sale) { if ($sale->date >= $this->startDate && $sale->date <= $this->endDate) { $revenue += $sale->value; } } return $revenue; } } 

class SalesReport { // ... public function totalRevenue() { $revenue = 0; foreach ($sales as $sale) { if ($this->saleWithinRange($sale)) { $revenue += $sale->value; } } return $revenue; } private function saleWithinRange($sale) { return $sale->date >= $this->startDate && $sale->date <= $this->endDate; } } 

The Rules of Simple Design 1. Passes the tests 2. Reveals intent 3. No duplication 

belongsTo(Author::class); } } 



@foreach ($books as $book)

• {{ $book->title }}

  by {{ $book->author->name }}
@endforeach



belongsToMany(Author::class); } public function byline() { return $this->authors->pluck('name')->implode(' & '); } } 



@foreach ($books as $book)

• {{ $book->title }}

  by {{ $book->byline() }}
@endforeach



The Rules of Simple Design 1. Passes the tests 2. Reveals intent 3. No duplication 4. Fewest elements 

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vs. class TagsController { public function store() { Tag::create(Request::all()); return Redirect::route('tags.index'); } } 

Stop worrying about ARCHITECTURE 

Focus on the SMALL STUFF 

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<< Insert live code demo here >> https://github.com/adamwathan/simple-design-ssphp16/tree/ssphp-start 

@adamwathan adamwathan.me https://joind.in/talk/b0f5a