dart-exercism/anagram/lib/anagram.dart

class Anagram {
  List<String> findAnagrams(String anagram, List<String> checkList) {
    List<String> anagrams = [];
    List<String> chars = anagram.toLowerCase().split('');

    for (final word in checkList) {
      if (word.length != anagram.length ||
          word.toLowerCase() == anagram.toLowerCase()) {
        continue;
      }

      final wordChars = word.toLowerCase().split('');
      if (wordChars.every((char) => chars.remove(char))) {
        anagrams.add(word);
        chars = anagram.toLowerCase().split('');
      }
    }

    return anagrams;
  }
}