frequency method

int frequency(String text, String symbol)

Count frequency of emoji containing in the text.

For example: frequency('I ❤️ Flutter just like ☕', '❤️') = 1

Implementation

int frequency(String text, String symbol) {
  if (text.isEmpty) return 0;

  int cnt = 0;
  for (final character in text.characters) {
    if (character == symbol) {
      cnt++;
    }
  }
  return cnt;
}