isConsonant method

bool isConsonant(
  1. String letter
)

Implementation

bool isConsonant(String letter) {
  return 'a' != letter &&
      'e' != letter &&
      'i' != letter &&
      'o' != letter &&
      'u' != letter &&
      'A' != letter &&
      'E' != letter &&
      'O' != letter &&
      'U' != letter;
}