April 2020
Intermediate to advanced
506 pages
20h 7m
Polish
Content preview from Go
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216 Rozdział 7.
Mapy i wartości zerowe
Oto przykładowy program,
w którym może to stanowić
problem. Ten kod błędnie
informuje, że student
“Karol”
nie zaliczył egzaminu, choć
w rzeczywistości nie odnotowano
dla niego żadnego wyniku:
Aby rozwiązać ten problem, przy dostępie do klucza mapy opcjonalnie zwracana jest też
druga wartość — logiczna. Jest ona równa
true
, jeśli zwrócona wartość została przypisana
do mapy, i
false
, jeżeli zwrócona wartość reprezentuje domyślną wartość zerową.
Większość programistów używających Go przypisuje tę wartość logiczną do zmiennej
ok
(ponieważ jest ona krótka i wygodna).
Jeśli chcesz sprawdzić tylko to, czy wartość ...
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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.