Konvèti atribit opsyonèl nan koleksyon vye granmoun pou koòd ki pi limyè, pi an sekirite ak polymorfik, elimine erè milya dola 
 
 TL;DR: ranplase nullable atribit opsyonèl ak koleksyon blan yo elimine null tcheke ak levage polymorphism. TL;DR: ranplase nullable atribit opsyonèl ak koleksyon blan yo elimine null tcheke ak levage polymorphism. Problèm rezoud 
 
 
 
 
 
 
 Nul referans Eksepsyon Eksepsyonèl Kondisyonèl Logik ak IFs Kòmanse erè fragile Atribisyon opsyonèl Kòd validasyon konplèks Polymorphism kontwole Kòd ki gen rapò ak odè https://hackernoon.com/how-to-find-the-stinky-parts-of-your-code-part-xxxix?embedable=true https://hackernoon.com/how-to-find-the-stinky-parts-of-your-code-part-xxx?embedable=true https://hackernoon.com/how-to-find-the-stinky-parts-of-your-code-part-iv-7sc3w8n?embedable=true https://hackernoon.com/how-to-find-the-stinky-parts-of-your-code-part-iii-t7h3zkv?embedable=true https://hackernoon.com/how-to-find-the-stinky-parts-of-your-code-part-ix-7rr33ol?embedable=true Etap 
 
 
 
 
 Identifye nullable atribit opsyonèl ki ta ka koleksyon Remplaze objè nullable sèl ak koleksyon vid Retire tout tcheke null ki gen rapò ak atribit opsyonèl sa yo Metòd mete ajou pou travay ak koleksyon olye pou objè inik Kòd echantiyon Premye public class ShoppingCart {
    private List<Item> items = new ArrayList<>();
    private Coupon coupon = null;
    
    public void addItem(Item item) {
        this.items.add(item);
    }
    
    public void redeemCoupon(Coupon coupon) {
        this.coupon = coupon;
    }
    
    public double total() {
        double total = 0;
        
        for (Item item : this.items) {
            total += item.getPrice();
        }
        
        // This a polluted IF and null check
        if (this.coupon != null) {
            total -= this.coupon.getDiscount();
        }
        
        return total;
    }
    
    public boolean hasUnsavedChanges() {
        // Explicit null check
        return !this.items.isEmpty() || this.coupon != null;
    }
    
    public boolean hasCoupon() {        
        return this.coupon != null;
    }
}
 public class ShoppingCart {
    private final List<Item> items = new ArrayList<>();
  
    // This version uses Optionals
    // Not all programming languages support this feature
    private Optional<Coupon> coupon = Optional.empty();

    public void addItem(Item item) {
        items.add(item);
    }

    public void redeemCoupon(Coupon coupon) {
        // You need to understand how optionals work
        this.coupon = Optional.ofNullable(coupon);
    }
    
    public boolean hasUnsavedChanges() {
        return !items.isEmpty() || !coupon.isPresent();
    }

    public boolean hasCoupon() {
        return coupon.isPresent();
    }
}
 Apre public class ShoppingCart {
  private List<Item> items = new ArrayList<>();
    
  // 1. Identify nullable optional attributes
  // that could be collections
  // 2. Replace single nullable objects with empty collections
  private List<Coupon> coupons = new ArrayList<>();
    
  public void addItem(Item item) {
      this.items.add(item);
  }
    
  // Step 4: Work with collection
  // instead of single nullable object
  public void redeemCoupon(Coupon coupon) {
      this.coupons.add(coupon);
  }
    
  // Step 4: Simplified logic without null checks
  public double total() {
    double total = 0;
      
    for (Item item : this.items) {
        total += item.getPrice();
    }
      
    // 3. Remove all null checks 
    // related to these optional attributes        
    for (Coupon coupon : this.coupons) {
        total -= coupon.getDiscount();
    }
      
    return total;
  }
    
  // Consistent behavior with empty collections
  public boolean hasUnsavedChanges() {
    // 4. Update methods to work with collections
    // instead of single objects 
    return !this.items.isEmpty() || !this.coupons.isEmpty();
  }
    
  // 3. Remove all null checks 
  // related to these optional attributes
  // Collection-based check instead of null check
  public boolean hasCoupon() {
    return !this.coupons.isEmpty();
  }
}
 Ki jan 
 
 [x] Semi otomatik sekirite ️ Refactoring sa a se anjeneral san danje lè ou kontwole tout pwen aksè nan atribit yo koleksyon an. Ou bezwen asire w ke pa gen okenn kòd ekstèn espere valè null ak fè fas ak API yo nan la. refactoring kenbe menm konpòtman ekstèn pandan y ap senplisye logik enteryè. Èske ou ta dwe tcheke ke tout konstriktè yo ak metòd faktori initialize koleksyon byen. Poukisa Kòd la se pi bon? Kòd refactored elimine ak diminye konpòtman konpòtman konplèksite. Nul pousantaj Eksepsyon Koleksyon vakyòm ak koleksyon ki pa vakyòm pote polymorfik, ki pèmèt ou trete yo uniformman. Kòd la vin pi prediktif paske koleksyon toujou egziste (pa gen okenn bwat) ak reponn a menm operasyon yo. Implemantasyon metòd vin pi kout ak plis konsantre sou logik biznis anvan manipilasyon null. Pwopozisyon an se align ak prensip la nan fè estats ilegal ki pa reprezante nan modèl domèn ou a, ki mennen nan yon kòd plis robust ak manyen. Koleksyon vakyòm ak koleksyon ki pa vakyòm se . polymorphic Ki jan yo amelyore bijection? ️ Nan mond lan reyèl, konteinè egziste menm lè yo se san danje. Si ou reprezante koleksyon opsyonèl kòm koleksyon vye granmoun anvan null, ou kreye yon modèl ki pi egzak nan reyalite. Null pa egziste nan mond lan reyèl, epi li toujou rompe . Bijection Li kenbe yon korespondans yon sèl-a-yon-yon ant konsèp reyèl ak modèl kominikasyon ou, kreye yon bon . Map la Lè ou retire yon koleksyon olye pou nulls, ou tou diminye . Kòmanse Limite nan ️ Yon refactoring sa a ka pa apwopriye lè null gen yon vle di semantik diferan de "pòch". Gen kèk APIs legacy ka espere valè null, ki mande pou layers adaptasyon. Èske ou bezwen asire ke tout chemen kòd inisyalize koleksyon konsistentman pou evite konbine null ak estasyon blan. Refactor ak AI 
 
 Suggested Prompt: 1. Identifye nullable atribit opsyonèl ki ta ka koleksyon 2. Remplaze objè nullable sèl ak koleksyon blan 3. Retire tout null tcheke ki gen rapò ak atribit opsyonèl sa yo 4. Ajou metòd yo travay ak koleksyon olye pou objè inik 5. Teste ke koleksyon blan ak non-kòz ap travay konsistentman Suggested Prompt: 1. Identifye nullable atribit opsyonèl ki ta ka koleksyon 2. Remplaze objè nullable sèl ak koleksyon blan 3. Retire tout null tcheke ki gen rapò ak atribit opsyonèl sa yo 4. Ajou metòd yo travay ak koleksyon olye pou objè inik 5. Teste ke koleksyon blan ak non-kòz ap travay konsistentman 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Without Proper Instructions 
 With Specific Instructions 
 
 
 
 ChatGPT 
 ChatGPT 
 
 
 
 Claude 
 Claude 
 
 
 
 Perplexity 
 Perplexity 
 
 
 
 Copilot 
 Copilot 
 
 
 
 Gemini 
 Gemini 
 
 
 
 DeepSeek 
 DeepSeek 
 
 
 
 Meta AI 
 Meta AI 
 
 
 
 Grok 
 Grok 
 
 
 
 Qwen 
 Qwen Chato Chato Claude nan Claude nan Perpleksite Perpleksite Pilòt Pilòt Twin nan Twin nan DeepSeek DeepSeek Objektif nan Objektif nan Pwodwi Pwodwi Pwen Pwen Dapre ️ 
 
 Null nan Nivèl 
 
 [x] Mwayen Relasyon ki gen rapò https://hackernoon.com/code-refactoring-tips-no-015-remove-null?embedable=true https://hackernoon.com/refactoring-014-how-to-remove-if?embedable=true Li se https://hackernoon.com/null-the-billion-dollar-mistake-8t5z32d6?embedable=true https://hackernoon.com/how-to-get-rid-of-annoying-ifs-forever-zuh3zlo?embedable=true Kredi imaj nan nan nan K. Pixabay nan Paj sa a se yon pati nan seri a Refactoring. https://maximilianocontieri.com/how-to-improve-your-code-with-easy-refactorings?embedable=true

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Refactoring 029 - Ki jan yo ranplase NULL ak Koleksyon

Refactoring 029 - Ki jan yo ranplase NULL ak Koleksyon

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