isKatakana method

bool isKatakana (
  1. 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);
}