文字列(String)のsubstringの使い方についての覚書。 他にも書き方はあると思いますが。 let Str: String = "123456789" /// /// 先頭1文字 - 1 /// print("\(Str.substring(to: Str.index(after: Str.startIndex)))") /// /// 先頭1文字以外 - 23456789 /// print("\(Str.substring(from: Str.index(after: Str.startIndex)))") /// /// 末尾1文字 - 9 /// print("\(Str.substring(from: Str.index(before: Str.endIndex)))") /// /// 末尾1文字以外 - 12345678 /// print("\(Str.subst
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