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coding-standards

Universal coding standards - naming, formatting, error handling, immutability, SOLID principles

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Atualizado há 4 meses

Ver no GitHub ↗ Licença: MIT

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Coding Standards

Naming Conventions

| Tip | Format | Ornek | |-----|--------|-------| | Variable | camelCase | userName, itemCount | | Function | camelCase, verb-first | getUserById, calculateTotal | | Class/Type | PascalCase | UserService, OrderItem | | Constant | UPPER_SNAKE | MAX_RETRIES, API_URL | | File | kebab-case | user-service.ts, order-item.ts | | Boolean | is/has/should prefix | isActive, hasPermission |

Immutability

// YANLIS: Mutate
user.name = newName;
items.push(newItem);

// DOGRU: Yeni obje
const updated = { ...user, name: newName };
const newItems = [...items, newItem];

Error Handling

// Custom error class
class AppError extends Error {
  constructor(public code: string, message: string, public statusCode = 500) {
    super(message);
  }
}

// Try-catch with specific errors
try {
  const result = await riskyOperation();
  return result;
} catch (error) {
  if (error instanceof ValidationError) {
    throw new AppError('VALIDATION', error.message, 400);
  }
  throw new AppError('INTERNAL', 'Unexpected error', 500);
}

Function Rules

  • Max 50 satir, tek sorumluluk
  • Max 3 parametre (fazlasi obje olarak)
  • Early return (nested if yerine guard clause)
  • Pure function tercih et (side effect yok)
// YANLIS: Deep nesting
function process(user) {
  if (user) {
    if (user.isActive) {
      if (user.hasPermission) {
        return doWork(user);
      }
    }
  }
}

// DOGRU: Early return
function process(user) {
  if (!user) return null;
  if (!user.isActive) return null;
  if (!user.hasPermission) return null;
  return doWork(user);
}

SOLID Principles

| Prensip | Kural | |---------|-------| | S - Single Responsibility | Her sinif/fonksiyon tek is | | O - Open/Closed | Extension'a acik, modification'a kapali | | L - Liskov Substitution | Alt tip, ust tipin yerine gecebilmeli | | I - Interface Segregation | Kucuk, specific interface'ler | | D - Dependency Inversion | Abstraction'a baglan, concrete'e degil |

Result<T,E> Pattern (Functional Error Handling)

Exception fırlatmak yerine explicit error dondur. Ozellikle API katmaninda, service'lerde ve veri islemede kullan.

// Result type tanimi
type Result<T, E = Error> =
  | { ok: true; value: T }
  | { ok: false; error: E };

// Kullanim
function parseConfig(raw: string): Result<Config, ValidationError> {
  try {
    const parsed = JSON.parse(raw);
    if (!isValidConfig(parsed)) {
      return { ok: false, error: new ValidationError('Invalid config shape') };
    }
    return { ok: true, value: parsed as Config };
  } catch {
    return { ok: false, error: new ValidationError('Invalid JSON') };
  }
}

// Tuketim
const result = parseConfig(input);
if (!result.ok) {
  logger.warn('Config parse failed', { error: result.error.message });
  return fallbackConfig;
}
const config = result.value;

Ne zaman kullan: Service layer, parser, validator, external API cagrisi Ne zaman kullanma: Basit utility, internal fonksiyon (try/catch yeterli)

Comment Rules

  • Yorumlar zamansiz olmali: "Simdi boyle cunku..." yerine "Bu yaklasim X sebebiyle tercih edildi" yaz
  • Neden > Ne: Kod ne yaptigini zaten gosteriyor, NEDEN yaptigini yaz
  • Clarity over brevity: Kisa yorum ama anlamsizsa, uzun ama anlamli yorum yaz
  • Yanlis yorum > yorum yok: Yanlis yorum tehlikelidir, guncellenmeyen yorum sil
// YANLIS: Ne yaptigini anlatiyor (gereksiz)
// Kullanici adini buyuk harfe cevir
const name = user.name.toUpperCase();

// DOGRU: Neden yapildigini anlatiyor
// Legacy API buyuk harf bekliyor, v3'te kaldirilacak
const name = user.name.toUpperCase();

function vs Arrow Function

| Durum | Tercih | Neden | |-------|--------|-------| | Exported fonksiyon | function declaration | Hoisted, debug stack trace'de gorunur | | React component | function declaration | Tutarlilik, DevTools'da isim gorunur | | Callback, inline | Arrow => | Kisa, this binding yok | | Method | Arrow (class field) | this binding garantili |

// DOGRU: Exported fonksiyon
export function calculateTotal(items: Item[]): number {
  return items.reduce((sum, item) => sum + item.price, 0);
}

// DOGRU: Callback
const filtered = items.filter(item => item.active);

Anti-Patterns

| Anti-Pattern | Cozum | |-------------|-------| | Magic number | Named constant kullan | | God class/function | Parcala, tek sorumluluk | | console.log debug | Logger kullan, commit etme | | Hardcoded values | Config/env variable | | Any type | Specific type tanimla |

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