kadai2-ramenjuniti #23
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課題2
1回目の宿題のテストを作ってみてください
io.Readerとio.Writerについて調べてみよう
io.Readerは、ioパッケージのMultiReaderやio/ioutilパッケージのReadAllなどで引数の型として利用されており、io.Writerも同様に、ioパッケージのMultiWriterやbufioパッケージのNewWriterなどで引数の型として利用されている。
io.Readerやio.Writerがあることで、ある構造体がReadメソッドやWriteメソッドを実装しているかどうかで共通化をすることができ、利用者側はその実態を意識せずに利用できる利点がある。例えば、io/ioutilのReadAllなどのio.Reader型を引数にとる関数では、io.Readerがあることで、引数の型が抽象化されるためデータの形式などを意識せずともその関数を利用することができる。