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You’ll learn what undefined means, how it...","preview":{"posterSrc":"//avatars.mds.yandex.net/get-vthumb/4099485/77e04fe1cc817cdd1f4b321ad7ac4753/564x318_1"},"target":"_self","position":"2","reqid":"1769398652307175-942864584620720117-balancer-l7leveler-kubr-yp-sas-243-BAL","summary":{"isFull":true,"fullTextUrl":"/video/result?ask_summarization=1&numdoc=1&noreask=1&nomisspell=1&parent-reqid=1769398652307175-942864584620720117-balancer-l7leveler-kubr-yp-sas-243-BAL&text=videoid:1902284853451082907","teaser":[{"list":{"type":"unordered","items":["Bu video, JavaScript'te tanımlanmamış veri türünü açıklayan bir eğitim içeriğidir.","Video, tanımlanmamış veri türünün ne olduğunu açıklayarak başlıyor. Tanımlanmamış veri türü, bir değişkene değer atanmadığında veya boş bir değişkene değer atanırken kullanılan \"undefined\" anahtar kelimesiyle ifade edilen bir durum. Ayrıca, tanımlanmamış veri türünün boş bir değişkene değer atanırken de kullanılabileceği belirtiliyor. 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Video boyunca çeşitli kod örnekleri üzerinden bu kavramlar somutlaştırılmaktadır."]},"endTime":203,"title":"JavaScript'te Undefined ve Not Defined Arasındaki Fark","beginTime":0}],"fullResult":[{"index":0,"title":"JavaScript'te Undefined ve Not Defined Farkı","list":{"type":"unordered","items":["JavaScript'te \"undefined\" ve \"not defined\" kavramları birbirinden farklıdır.","Undefined, bir değişkenin tanımlanmış olmasına rağmen henüz bir değere sahip olmadığı durumdur.","Not defined ise, bir değişkenin hiç tanımlanmamış olduğu durumdur ve bu durumda JavaScript bir referans hatası verir."]},"beginTime":1,"endTime":35,"href":"/video/preview/3445057350670731300?parent-reqid=1769398652307175-942864584620720117-balancer-l7leveler-kubr-yp-sas-243-BAL&text=Undefined&t=1&ask_summarization=1"},{"index":1,"title":"Undefined Örnekleri","list":{"type":"unordered","items":["\"let a\" şeklinde bir değişken tanımlandığında ancak değeri atanmadığında, bu değişken \"undefined\" olarak 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Video boyunca çeşitli kod örnekleri üzerinden (değişken tanımlama, dizi erişimi, fonksiyon kullanımı) undefined'in nasıl oluştuğu ve nasıl kontrol edilebileceği adım adım anlatılmaktadır."]},"endTime":674,"title":"JavaScript'te Undefined Kavramı ve Kullanımı","beginTime":0}],"fullResult":[{"index":0,"title":"JavaScript'te undefined Kavramı","list":{"type":"unordered","items":["Bu bölümde JavaScript'te undefined kavramının ne olduğu ve nasıl kullanıldığı anlatılacak.","Undefined, JavaScript'te bir değerin olmaması veya bir değişkenin tanımlanmış olmasına rağmen değeri olmaması durumunu temsil eder.","Undefined, bir değişkenin sadece tanımlanmış olmasına rağmen değeri atanmamış olması durumunda oluşur."]},"beginTime":0,"endTime":140,"href":"/video/preview/6532971828168539963?parent-reqid=1769398652307175-942864584620720117-balancer-l7leveler-kubr-yp-sas-243-BAL&text=Undefined&t=0&ask_summarization=1"},{"index":1,"title":"Undefined 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Undefined vs Not Defined in JavaScript Explained with Coding Examples! In this tutorial, we will deeply explore the difference between undefined and not defined in JavaScript. 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