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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8.2 CSVファイルを扱う
CSVとはComma-Separated Valuesの略で、多くの場合は「コンマ区切りのファイル形式」のことを指します。Goでは標準パッケージに encoding/csv が存在するので、簡単にCSVを扱えます。
encoding/csv パッケージは、GoDocを読む限り区切り文字としてコンマを主軸においているようです。他にもTSV（Tab-Separated Values）と呼ばれるタブ区切りや、
パイプ「 | 」やセミコロン「 ; 」など、区切り文字の設定を変えることでCharacter-Separated Values全般を扱えます。使い方を1つ覚えると他のフォーマットにも応用が効くので使い方を覚えて損のないパッケージでしょう。
Comma-Separated Valuesという意味でのCSVには、RFC 4180（Common Format and MIME Type for Comma-Separated Values (CSV) Files）と呼ばれる仕様があります。 encoding/csv はそれにしたがって実装されています。
RFC 4180は情報（Info: Informational）と分類されており厳密には標準仕様と言えませんが、現状は他に広く知られている仕様がないため、多くの場合で実務上の標準仕様として扱われています。つまり ...
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