A guess the word game in Dart

guess.dart

import 'dart:io';

void main() {
var word = "Random";
print("Guess the word!");
String? userGuess = stdin.readLineSync();
if (userGuess != null) {
  if (userGuess == word) {
     print("Congrats, the word was Random!");
  } else if (userGuess != word) {
      print("Sorry, wrong word.");
  }
 }
}