This dart code checks if a given word ends with 'ing' (return true) or not (return false)

ing-word-check.dart

void main() {
  // todo
  print("Hello World!");
  
  HighEngine firstWord = HighEngine(word: 'engine');
  
  print(firstWord.word);
  print(firstWord.checkWord());
  
  // sandbox
  String firstName = "Deji";
  print("${(firstName.length + 2) - 1}");
  print(firstName.split(''));
  for (int i = 0; i < 5; i++) {
    print(i);
  }
}

// 'ing'
class HighEngine {
  String word;
  
  HighEngine({required this.word});
  
  bool checkWord() {
    bool output = false; // default val
    // this method checks if the given word end with 'ing' or not
    // convert the given word to an array
    List wordArr = word.split('');
    // loop through the wordArr from the back; start search from the end of string
    for (int i = 0; i < wordArr.length; i++) {
      // do something
      // print("${(wordArr.length - 1) - i}");
      // print(wordArr[(wordArr.length - 1) - i]); // prints the wordArr from the end
      // check if the first char is g else stop
      if (wordArr[(wordArr.length - 1) - i] == 'g') {
        // true - first level of three passed
        i += 1;
        // check if the second char is n else stop
        if (wordArr[(wordArr.length - 1) - i] == 'n') {
          // true - second level of three passed
          i += 1;
          // check if the third char is i else stop
          if (wordArr[(wordArr.length - 1) - i] == 'i') {
            // true - last level passed
            output = true;
          } else {
            // false
            // jump out, pls
            break;
          }
        } else {
          // false
          // okay fine, jump out
          break;
        }
      } else {
        // false
        // japa x3
        break;
      }
    }
    
    return (output);
    
    // demo return
    // return (true);
  }
}