February 2015
Intermediate to advanced
664 pages
24h 26m
Polish
Content preview from Programowanie w JavaScript Rusz głową!
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Rozdział 12
Jak naprawdę działają konstruktory
Sposób działania konstruktorów
Wiesz już, jak można zadeklarować konstruktor oraz używać go do tworzenia nowych
obiektów; jednak warto także zajrzeć za kulisy konstruktorów, by przekonać się, jak
naprawdę działają. A oto klucz do tej tajemnicy: aby zrozumieć konstruktory, należy
wiedzieć, co robi operator
new
.
Zaczniemy od instrukcji, której użyliśmy wcześniej do określenia wartości zmiennej
fido
.
var fido = new Dog(”Burek”, ”mieszaniec”, 20);
Przyjrzyjmy się teraz prawej stronie operatora przypisania, gdzie dzieją się najważniejsze
rzeczy. Spróbujmy wykonać to wyrażenie.
1
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.