August 2025
Beginner to intermediate
552 pages
7h 58m
Japanese
Content preview from 初めてのGo言語 第2版 ―他言語プログラマーのためのイディオマティックGo実践ガイド
Become 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,
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.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.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.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.
13章標準ライブラリ
Go言語を使った開発で便利なのは、標準ライブラリが充実していることです。Pythonも同様ですが、アプリケーション構築に必要なものは「すぐに使えるようにすべて含める」という哲学に基づいています。Goは比較的新しい言語ですから、近年のプログラミング環境で遭遇するような問題の解決に向けて、さまざまなライブラリが用意されています。
標準ライブラリのパッケージをすべて説明することはできませんし、またその必要もありませんので†1、特に重要なパッケージに焦点を当てて、「イディオム的なGo」の原則をうまく表すような例をあげることにします。この章では入出力、時間・時刻、JSON、HTTPについて取り上げます。なお、errors（9章）、sync（12章）、context（14章）、testing（15章）、reflectおよびunsafe（16章）については、それぞれの章を参照してください。
[†1] 標準ライブラリの詳細は公式サイト（https://golang.org/pkg）を参照してください。
13.1 入出力
プログラムは通常、何らかのデータ（入力）を受け取り、何らかのデータを出力します。Go言語の入出力に関する「哲学」をもっともよく表しているのがパッケージioです。このパッケージで定義されている2つのインタフェースio.Readerとio.Writerは、数あるGoのインタフェースの中でも2番目と3番目によく使われるものでしょう。
![[注記]](/api/v2/epubs/urn:orm:book:9784814401192/files/images/note.png) |
|
もっとも頻繁に使われるインタフェースは何でしょうか。それは「 ... |
Become 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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.