April 2022
Beginner to intermediate
464 pages
6h 44m
Japanese
Content preview from 実用 Go言語 ―システム開発の現場で知っておきたいアドバイス
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1.1 変数やパッケージ、メソッドなどに名前を付けるには
コードが何をしているのかを伝える上で、登場する変数、関数、構造体、パッケージ名に適切な名前をつけるのは大切なことです。プログラムを読み込んで処理するのはコンパイラーですが、プログラムを作成したりメンテナンスするのは人間だからです。
複数の変数があるときに、それぞれの役割がわかるというだけではなく、それが変数なのか、関数なのか、構造体なのか、パッケージなのか… それぞれの種類を判別しやすく名前をつけるのも重要なことです。また、ある変数がパブリック変数なのかローカル変数なのかを区別するためにどういう名前をつけるかなど、言語ごとに「良い名前」「推奨される名前」のつけ方には慣習があります。新しい言語を学ぶときには、単に文法を学ぶだけでなく、この慣習を学ぶことも大切です。
Goでは、命名についての公式見解があります。基本的にはEffective Go 1 に従うのがGoらしいコードだと言えます。ここではEffective Goをベースにしながら、Go Code Review Comments 2 や標準ライブラリなどで、Go がどのような命名をしているかについて紹介します。
1.1.1 変数名
変数名が複数の単語で構成されるとき、Goでは _ （アンダースコア）を使用せずMixedCapsとする慣習となっています。したがって max_length ではなく maxLength と名づけます。また他のパッケージから参照できる公開された変数は、変数名の先頭を大文字とする仕様になっています。最初の文字が小文字から始まる場合は非公開の変数です。よって ...
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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.