November 2012
Intermediate to advanced
160 pages
3h 40m
Polish
Content preview from JavaScript - mocne stronyBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Dodatek A. Kłopotliwe cechy języka
W tym rozdziale przyjrzymy się najbardziej problematycznym cechom JavaScriptu, których nie da się po prostu omijać. Trzeba je znać i umieć sobie z nimi radzić.
Zmienne globalne
Najgorszą ze wszystkich złych stron JavaScriptu jest zależność od zmiennych globalnych. Zmienna globalna to taka, która jest widoczna w każdym zasięgu. Zmienna globalne bywają bardzo wygodne w małych programach, ale stają się coraz większym ciężarem w miarę jak program się rozwija i powiększa. Ponieważ zmienne takie mogą być modyfikowane z każdego miejsca w kodzie, zapanowanie nad zachowaniem programu uzależnionego od zmiennych globalnych szybko się komplikuje. Użycie zmiennych globalnych podważa niezawodność programów.
Zmienne globalne utrudniają ...
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