Ładny Kod

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Z PHPers Rzeszów, z dnia 27.01.2016. Tematem jest ładny, czysty i czytelny kod. Kilka prostych sztuczek, odrobina zdrowego rozsądku i logicznych reguł

Co to znaczy?

Ludzki mózg nie jest w stanie podążać za
rozgałęzieniami

Jest liniowy

Ogarnia siedem pojęć na raz – większość zdań
składa się z siedmiu wyrazów

Co to znaczy?

Brzydki kod jest pełen rozgałęzień

Jest trudny w czytaniu

Wymaga skupienia do zrozumienia

Jest mylący, zagmatwany, nasztuczkowiony

Przekracza zdolności pojmowania typowego
człowieka

Jak?

Odwróć ify

Jedna rzecz na raz

Nie grzeb innym w spodniach

Rąbaj metody

Nie gmatwaj

Używaj narzędzi

Odwróć ifa
Z przodu liceum
if ($request->isMethod('post')) {
if ($request->isType('ajax')) {
$data = $request->getData();
if ($data->isValid($this->rules)) {
$order = new Order($data);
return $order;
Z tyłu groza
} else {
return false;
}
} else {
return false;
}
} else {
return false;
}

Odwróć ifa
function parseOrder($request) {
if (! $request->isMethod('post')) {
return false;
}
if (! $request->isType('ajax')) {
return false;
}
$data = $request->getData();
if (! $data->isValid($this->rules)) {
return false;
}
$order = new Order($data);
return $order;
}

Jedna rzecz na raz

return $this->messages[$status];

Takie komentarze:
 // ----------- ORDER ----------------
 // calculate vat
 // 3. attach mouse to a cat

Zmienne $return, $ret, $result

Funkcje które można scharakteryzować jako te:
 Które liczą i formatują
 Które pobierają, aktualizują i zapisują

$Nie grzeb obiektom w spodniach if($order->getParams()->getParam('payment_type') == PaymentType::CARD) { $order->getPayment()->getCard()->save(); }  Jeden -> w linii  Zamiast grzebać zapytaj: if($order->hasCardPayment()) { $order->saveCard(); }  Nie używaj tablic do przekazywania przetworzonych danych!  Nie dotyczy DQL$

Siecz, rżnij, rąb!

Sztywny limit długości metody (25 linii)

Sztywny limit głębokości wcięcia (2 wcięcia)
function doSomething($data) {
foreach ($data as $item) { // 1
$item->doMe(); // 2
if ($item->isYou()) {
$item->doYou(); // <---- Bąęł!
}
}
}

Sztywny limit ilości metod w klasie (larva style!)

Macarena!

Nie używaj sztuczek i mało znanych metod
 next jako podgląd pierwszego elementu tablicy

Nie używaj pełnych nazw namespace'ów
 Something/OtherThing/Library/Macarena

Jedna kropka, strzałka przyrównanie na linię

Warunki w if w jednej linijce
 Wyliczaj przed ifem
 Warunki do widoku wyliczaj w kontrolerach

Nigdy nie pisz własnego frameworka!

Używaj narzędzi

Pull request podstawowym narzędziem dbania
o przejrzystość kodu:
 Warto używać GIFów
 Brak świętych krów

Ciągła integracja i walidacja kodu:
 csfixer
 mess detector
 copy paste detector

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Ładny Kod

1. Ładny Kod Jakub Nietrzeba

3. Co to znaczy?  Ludzki mózg nie jest w stanie podążać za rozgałęzieniami  Jest liniowy  Ogarnia siedem pojęć na raz – większość zdań składa się z siedmiu wyrazów

4. Co to znaczy?  Brzydki kod jest pełen rozgałęzień  Jest trudny w czytaniu  Wymaga skupienia do zrozumienia  Jest mylący, zagmatwany, nasztuczkowiony  Przekracza zdolności pojmowania typowego człowieka

5. Co to znaczy?

6. Co to znaczy?

7. Jak?  Odwróć ify  Jedna rzecz na raz  Nie grzeb innym w spodniach  Rąbaj metody  Nie gmatwaj  Używaj narzędzi

8. Odwróć ifa Z przodu liceum if ($request->isMethod('post')) { if ($request->isType('ajax')) { $data = $request->getData(); if ($data->isValid($this->rules)) { $order = new Order($data); return $order; Z tyłu groza } else { return false; } } else { return false; } } else { return false; }

9. Odwróć ifa function parseOrder($request) { if (! $request->isMethod('post')) { return false; } if (! $request->isType('ajax')) { return false; } $data = $request->getData(); if (! $data->isValid($this->rules)) { return false; } $order = new Order($data); return $order; }

10. Jedna rzecz na raz  return $this->messages[$status];  Takie komentarze:  // ----------- ORDER ----------------  // calculate vat  // 3. attach mouse to a cat  Zmienne $return, $ret, $result  Funkcje które można scharakteryzować jako te:  Które liczą i formatują  Które pobierają, aktualizują i zapisują

11. Nie grzeb obiektom w spodniach if($order->getParams()->getParam('payment_type') == PaymentType::CARD) { $order->getPayment()->getCard()->save(); }  Jeden -> w linii  Zamiast grzebać zapytaj: if($order->hasCardPayment()) { $order->saveCard(); }  Nie używaj tablic do przekazywania przetworzonych danych!  Nie dotyczy DQL

12. Siecz, rżnij, rąb!  Sztywny limit długości metody (25 linii)  Sztywny limit głębokości wcięcia (2 wcięcia) function doSomething($data) { foreach ($data as $item) { // 1 $item->doMe(); // 2 if ($item->isYou()) { $item->doYou(); // <---- Bąęł! } } }  Sztywny limit ilości metod w klasie (larva style!)

13. Macarena!  Nie używaj sztuczek i mało znanych metod  next jako podgląd pierwszego elementu tablicy  Nie używaj pełnych nazw namespace'ów  Something/OtherThing/Library/Macarena  Jedna kropka, strzałka przyrównanie na linię  Warunki w if w jednej linijce  Wyliczaj przed ifem  Warunki do widoku wyliczaj w kontrolerach  Nigdy nie pisz własnego frameworka!

14. Używaj narzędzi  Pull request podstawowym narzędziem dbania o przejrzystość kodu:  Warto używać GIFów  Brak świętych krów  Ciągła integracja i walidacja kodu:  csfixer  mess detector  copy paste detector

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