April 2020
Intermediate to advanced
506 pages
20h 7m
Polish
Content preview from Go
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342 Rozdział 11.
Interfejs Stringer
Możesz użyć funkcji
Printf
, aby zaokrąglić liczbę i dodać skrót reprezentujący jednostkę miary, jednak
stosowanie tej techniki w każdym miejscu, gdzie potrzebujesz omawianych typów, byłoby żmudne.
Dlatego w pakiecie
fmt
zdefiniowany jest interfejs
fmt.Stringer
, umożliwiający określenie
w każdym typie, w jaki sposób mają być wyświetlane wartości. Łatwo jest dodać w typie
implementację interfejsu
Stringer
. Wystarczy zdefiniować metodę
String()
zwracającą wartość
typu
string
. Oto definicja interfejsu
Stringer
:
Oto przykładowy typ
CoffeePot
implementujący interfejs
Stringer
:
Tworzenie i wyświetlanie
wartości typu ...
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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.