isKatakana method
- String input
Tests if input
consists entirely of katakana characters.
The input
String
cannot be null or empty.
isKatakana('ゲーム'); // true
isKatakana('A'); // false
isKatakana('あ'); // false
isKatakana('あア'); // false
Implementation
bool isKatakana(String input) {
assert(input != null);
assert(input.isNotEmpty);
return input.chars.every(_isCharKatakana);
}