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İkisi de block-scoped'tır, bu yüzden (b) yanlıştır. `const` işaret ettiği değeri dondurmaz — bir `const` objenin property'leri hâlâ değiştirilebilir; bu yüzden (d) çok yaygın bir yanılgıdır.",{"id":170,"topic":9,"difficulty":171,"body":172,"options":173,"correct_key":163,"explanation":182},"019f56bb-ba73-750f-a83f-b2fdb59103d4",2,"```\nconsole.log(a);\nconsole.log(b);\nvar a = 1;\nlet b = 2;\n```\nBu kod çalıştığında ne olur?",[174,176,178,180],{"key":157,"text":175},"Önce `undefined`, sonra `undefined` basar",{"key":160,"text":177},"Önce `1`, sonra `2` basar",{"key":163,"text":179},"`undefined` basar, sonra `b` satırında ReferenceError fırlatır",{"key":166,"text":181},"Daha ilk satırda ReferenceError fırlatır","`var a` hoist edilir ve `undefined` ile ilklenir; bu yüzden atamadan önce `a` okumak `undefined` basar. `let b` de hoist edilir ama tanımına kadar temporal dead zone'da kalır; erken okunması ReferenceError fırlatır. `a` önce basılıp başarılı olduğundan hata ilk satırda değildir (d).",{"id":184,"topic":9,"difficulty":171,"body":185,"options":186,"correct_key":160,"explanation":195},"019f56bb-ba73-7aa4-b63f-9ca25c53b315","```\nfunction makeCounter() {\n  let count = 0;\n  return function () {\n    count += 1;\n    return count;\n  };\n}\nconst next = makeCounter();\nconsole.log(next(), next(), next());\n```\nBu kod ne basar?",[187,189,191,193],{"key":157,"text":188},"`1 1 1`, çünkü `count` her çağrıda 0'a sıfırlanır",{"key":160,"text":190},"`1 2 3`, çünkü iç fonksiyon aynı `count`'u görmeye devam eder",{"key":163,"text":192},"`0 1 2`, çünkü `count` artırılmadan önce döndürülür",{"key":166,"text":194},"Hata fırlatır, çünkü `count` iç fonksiyonun içinde tanımlı değil","`makeCounter`, `count`'u closure ile kapatan bir iç fonksiyon döndürür; bu değişken sıfırlanmak yerine çağrılar arasında yaşar, bu yüzden üç çağrı 1, 2, 3 verir. Artırma `return`'den önce olur, yani hiç 0 basılmaz (c); closure tam da bu yüzden `count`'u içeride görünür kılar (d).",{"id":197,"topic":9,"difficulty":171,"body":198,"options":199,"correct_key":166,"explanation":208},"019f56bb-ba74-70ed-ad34-5b880cded04c","Normal (arrow olmayan) bir fonksiyon `obj.method()` şeklinde çağrıldığında `this` neye işaret eder?",[200,202,204,206],{"key":157,"text":201},"Fonksiyonun nasıl çağrıldığından bağımsız olarak global objeye",{"key":160,"text":203},"Fonksiyon objesinin kendisine",{"key":163,"text":205},"Fonksiyona ilk argüman olarak ne geçildiyse ona",{"key":166,"text":207},"Metodun üzerinde çağrıldığı objeye — burada `obj`'ye","Normal fonksiyonda `this`, çağrı yerine (call site) göre belirlenir; metot olarak çağrılınca `this`, noktadan önceki objeye bağlanır. Aynı fonksiyon düz (metot olmadan) çağrılırsa `this`, global objeye ya da strict mode'da `undefined`'a düşer — (a) yalnızca bu bağsız durumda doğrudur.",{"id":210,"topic":9,"difficulty":171,"body":211,"options":212,"correct_key":160,"explanation":221},"019f56bb-ba74-7577-8eb4-be803d205d0a","```\nconsole.log(0 == '');\nconsole.log(0 == '0');\nconsole.log('' == '0');\n```\nBu kod sırasıyla ne basar?",[213,215,217,219],{"key":157,"text":214},"`true`, `true`, `true`",{"key":160,"text":216},"`true`, `true`, `false`",{"key":163,"text":218},"`false`, `false`, `false`",{"key":166,"text":220},"`true`, `false`, `false`","`==` ile bir sayı bir string'le karşılaştırılırken iki taraf da sayıya coerce edilir: `0 == ''` → `0 == 0` (true), `0 == '0'` → `0 == 0` (true). Ama `'' == '0'` iki string'i doğrudan, coercion olmadan karşılaştırır; sonuç `false`. `===` kullanılsaydı tipler farklı olduğu için üçü de `false` olurdu.",{"id":223,"topic":9,"difficulty":171,"body":224,"options":225,"correct_key":163,"explanation":234},"019f56bb-ba74-7aa4-9072-cb23d6b2ba74","Neden birçok JavaScript stil rehberi `==` yerine `===` kullanmayı önerir?",[226,228,230,232],{"key":157,"text":227},"`===` daha hızlıdır çünkü sağdaki operandı hiç okumak zorunda kalmaz",{"key":160,"text":229},"`==` artık deprecated'dir ve dilden kaldırılacaktır",{"key":163,"text":231},"`===` type coercion yapmadan karşılaştırır, sonuçlar daha öngörülebilir olur",{"key":166,"text":233},"`===` objeleri içeriklerine göre karşılaştırabilir, `==` karşılaştıramaz","`==`, yanlış anlaşılması kolay coercion kurallarını uygular (örneğin `0 == ''` true'dur); `===` ise hem tip hem değerin eşleşmesini ister ve sürprizleri önler. `==` deprecated değildir (b) ve hiçbiri objeleri içeriğe göre karşılaştırmaz — ikisi de referans karşılaştırır 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