April 2020
Intermediate to advanced
506 pages
20h 7m
Polish
Content preview from Go
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Gdy funkcja zwraca wartość błędu, zwykle musi też zwrócić wartość podstawową. Jednak wartości
zwracane razem z wartością błędu należy traktować jako niewiarygodne i je ignorować.
Kiedy wywołujesz funkcję, która zwraca wartość błędu, ważne jest, aby przed wykonaniem dalszych
operacji sprawdzić, czy ta wartość to
nil
. Każda inna wartość oznacza błąd, który trzeba obsłużyć.
Sposób obsługi błędu zależy od sytuacji. W funkcji
paintNeeded
najlepszym rozwiązaniem może być
pominięcie bieżących obliczeń i kontynuowanie wykonywania programu:
Jednak ponieważ ten program jest tak krótki, można też wywołać funkcję
log.Fatal
,
aby ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.