xxxxxxxxxx
List<String> strings = ['Hello', 'World', '!'];
String joinedString = strings.join(' ');
print(joinedString);
xxxxxxxxxx
List<String> yourList = ["20", "3005", "2"];
// To test that the above the above
yourList.join() == '2030052'; // true
yourList.join(',') == '20,3005,2'; // true, with "," delimiter