Day 7

day7.dart

void main() {
  swapCase('Www.HackerRank.com');
  swapCase('Dart2');
  swapCase('HackerRank.com presents "Dart 2".');
}

swapCase(String text) {
  var literalList = text.split("");
  var output = [];
  for (var i = 0; i < literalList.length; i++) {
    if (literalList[i] == literalList[i].toUpperCase()) {
      output.add(literalList[i].toLowerCase());
    } else {
      output.add(literalList[i].toUpperCase());
    }
  }
  String output1 = output.join();
  print(output1);
}

/*
 You are given a string and your task is to swap cases. In other words, convert all lowercase letters to uppercase letters and vice versa.
 */