February 2015
Intermediate to advanced
664 pages
24h 26m
Polish
Content preview from Programowanie w JavaScript Rusz głową!
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Rozdział 4.
Post inkrementacja
myImportantCounter = myImportantCounter + 1;
Kiedy ta instrukcja zostanie wykonana, wartość zmiennej myImportantCounter
będzie większa o jeden, niż była przed jej wykonaniem.
Tutaj pobieramy wartość tej
zmiennej i powiększamy ją
o jeden.
W rzeczywistości operacja tego typu jest wykonywana tak często, że język JavaScript ma dla niej specjalny,
skrótowy zapis. Jest to tzw. operator postinkrementacji, który — niezależnie od swojej wymyślnej nazwy — jest
całkiem prosty. Korzystając z tego operatora, całą powyższą instrukcję można zapisać w następujący sposób.
myImportantCounter++;
Po wykonaniu tej instrukcji wartość zmiennej ...
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