April 2020
Intermediate to advanced
506 pages
20h 7m
Polish
Content preview from Go
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156 Rozdział 5.
Funkcja len
Sprawdzanie długości tablicy za pomocą funkcji len
Pisanie pętli, która używa tylko poprawnych indeksów, jest czasem trudne. Na szczęście
istnieje kilka technik, które ułatwiają to zadanie.
Pierwsza z nich polega na sprawdzeniu liczby elementów tablicy przed dostępem do nich.
Można to zrobić za pomocą wbudowanej funkcji
len
, która zwraca długość tablicy
(liczbę zapisanych w niej elementów).
Gdy tworzysz pętlę przetwarzającą całą tablicę, możesz użyć funkcji
len
do sprawdzenia, z których indeksów można bezpiecznie korzystać.
Jednak to podejście też jest narażone na błędy. Gdy funkcja
len(notes)
zwraca wartość
7
, największy ...
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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.