toKatakana method
Converts hiragana into katakana.
ひらがなをカタカナに変換します。
final text = "あいうえお";
final converted = text.toKatakana(); // "アイウエオ"
Implementation
String toKatakana() {
return replaceAllMapped(RegExp("[ぁ-ゔ]"),
(Match m) => String.fromCharCode(m.group(0)!.codeUnitAt(0) + 0x60));
}